Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dbd7e4c41c0ffb4…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 19:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f11b210b4550803e4d8ae25bbcbac59 SHA-1: e3dec167bf27353d859c61ad8e4957bda36b4c8c SHA-256: 2dbd7e4c41c0ffb47ae87ac679e88a16ebc22485d45abfaf4ac6e3fe50928ec6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable hosting, a common tactic for phishing and malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method used to evade static analysis. ClamAV detection and ML classification confirm its malicious nature, suggesting it's a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://infrive.ru/uplcv?utm_term=androking+gta+sa PDF link annotation
    • http://rsst77.ru/upload/files/fuzupopude.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/37792838526.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/56683341719.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/71708636153.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/jidimulupejo.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/tebixas.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/46348221400.pdfIn PDF document text
    • https://frisch.ro/files/file/fobinamojapadopaxarazeno.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e297e378c---fofezupemenodiputuzeko.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/9063466735.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/sogupokojiwopana.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/kamuwukejajibizirojelimi.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/86940399551.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/81929931829.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/12065496948.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/49300152708.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/12611330646.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/34746421078.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/8516a3f27935908ec9b6ad74847f756c/31085344403.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/xufado.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/21594852467.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/niwadazexotexokib.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/gr410u51gb0qjeivs3q00rh0um/75851325079.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/10284638612.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/38401044171.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/tawawi.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/gegaji.pdfIn PDF document text
    • http://inica.org/files/file///wazukuvotafekolesive.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 18236 bytes
SHA-256: 83e705a2e30df0add7b8587bfd06aea9ee974716bc397302cf4ab5f3b540d3d5
font_02_sfnt_off0001143d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143D 10316 bytes
SHA-256: d541620724854eb397d670e995ec3e9ecfed20a7eedcea86afae5a529ee52aaa

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