Malicious PDF — malware analysis report

Static analysis result for SHA-256 34254d5628b3ff51…

MALICIOUS

PDF

254.6 KB Created: 2021-07-15 15:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b1c54cabf716041f15c607eda49b846d SHA-1: 8e543d7d127851b21498fedabd0a92b546ef3d6a SHA-256: 34254d5628b3ff51378eceb7e40c0304384b947b037f6629e09449beb743fa06
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan payload. The presence of a link farm pointing to compromised WordPress upload storage, combined with an SEO redirector, suggests a phishing lure designed to trick users into downloading a malicious document. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to deliver a malicious payload, likely through a compromised CMS upload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7938

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a50134f538---maxolebipekamoxutodizuvi.pdf In PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c4094f38---38031083276.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865caf395b8---13065803417.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f35c116a2d502fbd0ced1f8148ff9566/81241243704.pdfIn PDF document text
    • http://abc-tel.ru/data/File/66957490179.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/572ae7d6e2eb36a65bc873c2798eca88/80815689757.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab300666079---xexewanatukekupu.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/xaton.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/5888b803f5ce6014d62c2081d86f8419/bakewabifo.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/2e3c7474ce1e9d063ba83dadc0e26e09/tirele.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/pojilumupinidor.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/cpp2a5l38s10h1c074sbemp433/kinewajomuje.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/bakevekekaxadi.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/02495e5804982f4c0e423f0c04270162/rejoboboviwekigumef.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/58837956294.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/60083738904.pdfIn PDF document text
    • https://brod-plovdiv.com/images/wabosupodufugesubeni.pdfIn PDF document text
    • https://puntoagricoltura.it/file/89842487821.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/xezojerozurewidisoted.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/rulakin.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/dhndr3ilnuh21kui7lk6459at7/bajeritibopabuw.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/53480892751.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607786c820da3---41300440964.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/044bfcf3ade782300ae021787ea9f66d/42029341090.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095ba7d95ff7---zapojabezajonafuzazuran.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=lesbian+mothers+swap+daughtersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000274b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x274B3 23208 bytes
SHA-256: c29ee562aea5cb112ba0d0ac84c4ff4b9a5e00172ce4d90add52ccabc67a50bd
font_01_sfnt_off0002a08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A08E 41776 bytes
SHA-256: 8ce5a5f08ca44c6742d9cb3247987d98804d7fe99d9e95f3de5176b247ced976
font_02_sfnt_off0002ff18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0003172f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3172F 11076 bytes
SHA-256: 800053a17ce8760986282c967fd9c25177d5c7fae15a7db125c2433327840351
font_04_sfnt_off00033065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33065 69892 bytes
SHA-256: cb9e99978d6957192ce9a9514e7175a5bc1d4fbfa76b3583b5b9ca596be7705c