Malicious PDF — malware analysis report

Static analysis result for SHA-256 19dcf4138467a658…

MALICIOUS

PDF

73.2 KB Created: 2021-09-11 03:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 824e48a4a1ff064a7edd80fc1f82e42d SHA-1: 8364b44aede1c51186421d0d84735af507cc12b0 SHA-256: 19dcf4138467a65875c134c45361b54e87503a05c4bc202c896d3da928b05766
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ooexperience.be/assets/Image/files/zelifazuwululunepoxo.pdf In PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/lilebelojo.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/70911532393.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/wafuzimaxuzovibiwivir.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/2723146244.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161371151c63da---gomitolinimebogi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/89498665592.pdfIn PDF document text
    • https://betsin.org/userfiles/files/gifojamavarapudawurazeba.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/natefuduzebake.pdfIn PDF document text
    • https://ka-base.no/images_students/files/tifivi.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/gusunad.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rakiverenufaj.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/40140434929.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323f5e855f4---zuxezopivi.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/rokodepozuxizomixidawa.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1612e98a6d5cc8---pinoboluvuvivenawaf.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dbd0bb78b---67319711455.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/tozuminikurusudetovawagot.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/11676091819.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161361bdbbef72---xafanenoxofilujojufuda.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/pewuzopasudi.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/diwoboluxeleronuxixage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=watch+paw+patrol+season+1PDF link annotation
    • https://lapdonline.org/file/98078151679.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_off0000bb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33E 17044 bytes
SHA-256: 92997a8a120c0565049288aebc12c33631c61f81a09d54b9ba57b4b848a56748
font_02_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 10512 bytes
SHA-256: b30e4883af8524f5f6a0c62a9dc299389cdf4f31e54847fcc54a816354eceb80

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