Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1f5cc4543ad973…

MALICIOUS

PDF

81.8 KB Created: 2021-07-16 07:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a4c5cd0631850be25766052585dd80f SHA-1: ba13986a6af23eed9b27aefa13cdfa805a6d0a50 SHA-256: 4a1f5cc4543ad9732877a3a814e10f34e952eced0a1314b470ef49a851934ce3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various disposable hosting domains, likely to download further malicious content. The presence of a fake invoice lure suggests a phishing or scam attempt, potentially leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/sojajagezofaxitukutukit.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ede7d1162e1---55272556235.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/17149829122.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/39012470506.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/wajawufalofobi.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160838f2b52780---sutosodivaz.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160701e6d3f369---31313701254.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/lijasegupufafapanirosu.pdfIn PDF document text
    • http://thedigitalscorecard.com/userfiles/files/21609035924.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/93795167055.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/vosuxape.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/muriratimaviripo.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/83205822412.pdfIn PDF document text
    • http://calebdobe.com/clients/875189/File/39414642863.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/74961979395.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be33c3e1c46---jedijugomadanex.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/libolefirezasuki.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/mawales.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/34746311806.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/4c4c193cfe782a4e93a04656cd4aa85b/98056234097.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210526/file/tubifalirig.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/sixobelovemit.pdfIn PDF document text
    • http://cjatkinson.com/userimages/depip.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/najupelesomo.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a3fd07d5---17087024749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+is+copra+actPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 10184 bytes
SHA-256: 65595a7d401d1e13805601c213844aed3cb5cbded9c10a8aa40779c1c86589cd
font_02_sfnt_off00010deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEB 16888 bytes
SHA-256: 78cc7c86b1d8be9f561f39539b718fbd4439975e7ceb43aef7701025fa59dc22