Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa9985bcc468e25…

MALICIOUS

PDF

80.7 KB Created: 2021-09-21 06:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e8eb14a7a3fb18984daad842e7443c83 SHA-1: 1e3e78a38e9b0804b90a5877e030be155b23dc6c SHA-256: 1fa9985bcc468e2588cd6ef4b3dab31d2e14c45b53271d369b8614c39d248eea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://1544-7419.net/upload/fckeditor/file/2814212173.pdf In PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/53586709030.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/gozikifoje.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/16089234489.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/42304857075.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/tovifalogirunolefupikete.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/wavawupulawemu.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/180539306161307970d600f.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/gexulaboperizovizujaz.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/pozanamol.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/bbd5c538966a181ea7a354851041770a/jogipinuneluteda.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/81677843824.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210903234607.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/6869755862.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/05bb1d72cdb73ab76611875701433c5a/zokizututupenoj.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/59112550652.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/benuzoxasogososisavufoka.pdfIn PDF document text
    • http://immopolignano.lu/images/33508840359.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/3194869792.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/ribibowibemedi.pdfIn PDF document text
    • http://falconltd.pl/cache/file/51661861743.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16147ee9e56745---gonabeparowemol.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/mukuwexuja.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/39f34d74d9ca609b5d8cac8379ccf046/woxadum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=into+the+white+night+2009+full+movie+eng+subPDF 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_off0000d8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D4 16788 bytes
SHA-256: 3ca778f6af385e81a2fc14101a39846431165bcbf15d14b53951d3a9817f6654
font_01_sfnt_off00010436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10436 11152 bytes
SHA-256: 230aa5a4e0b101649a09914aa1dee9b7c36b9bdc0fff9ebf45d782f4e9998770
font_02_sfnt_off00011e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1