Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4788ef7372eb69c…

MALICIOUS

PDF

100.9 KB Created: 2021-07-14 02:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e8f432dbae011e1d1ad321ff14132d5 SHA-1: 8027e9ae7ea825cd5672f7fa2e0abf290f72be1b SHA-256: e4788ef7372eb69c9dfa12190ba45168a2a64fff6dde84e16b203cdf10227ab1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://wastran.ru/uplcv?utm_term=square+root+32+simplified PDF link annotation
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/5b0048c879d19f6b3b950aec91962ff7/wavijaworivalugobinotuxev.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/95638062685.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/99013160480.pdfIn PDF document text
    • http://delve-cr.com/uploads/52085477545.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/dexanefufinefefa.pdfIn PDF document text
    • http://fittbike.hu/files/file/zajamaber.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af8ab0b206---31262300290.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/4999d7373e0c49291ecfce3d4705a551/gesoguzus.pdfIn PDF document text
    • https://bio86.net/fichiers/piruxemofezekisakoxenenin.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607acb0f41000---dabijavaduzitosev.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/webasekonivutozixevesar.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcc2f24dbd---wevaturesuval.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160725bb06cffb---negitifiwo.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/98775237553.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99011398985.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/90hjdcunq8821aot6gbp293s5r/belexolagizopeguwavas.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7a988bf5d---sigevoborudim.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f109eb5a3---85778251421.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/iiad7u989vdoibdf9e5p87gva1/66283029159.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021071003233343.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c336b8332b3---buvewu.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/80469697789.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wunuzelulitixavigoro.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mexevefimevuwejaf.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_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 17708 bytes
SHA-256: 66066945f4ea2106606056b6633a02eb0c6984893a599caab55ee5d9d146f397
font_01_sfnt_off000152c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C2 11168 bytes
SHA-256: c7455169e8f19588fe942a465af9d1b28527a595d975378bd4a0d88a73777360
font_02_sfnt_off00016cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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