Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff9040e36b28be5…

MALICIOUS

PDF

85.8 KB Created: 2021-06-27 06:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 61db8abaa28f13e4f6620cb60420dd78 SHA-1: be689c78e3f3df7fb772df356c7cd6c0d071436c SHA-256: 6ff9040e36b28be5b318f7d441ad608f7a598d929e4b6c944e37b3f472366fc9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/972352936781ee4a062dac17897b440f/4574399624.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ebaa8e464---84100806531.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/050bcdca039d610bf1692218baecc3e5/tosor.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/sokowuj.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2c585710f00a97b93d4db76f971c06de/94022837300.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/78076738327.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9ed22b337---33744304133.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1439778298---gufeki.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/i7rcu98mghutlf77ogov23evr3/kozubikeduvavefunuvaviwo.pdfIn PDF document text
    • http://healthywithhart.com/res/file/xemuxog.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/29665136058.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/65762725a9d684671ada6ed915f86be3/bijevaxo.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/eb9cb02cf3b35b6762dbdcc8d05ad353/juvexixub.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa483d44c---bedesubupelinij.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/pupugebufuvu.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/84ftaf863dk1r6ehfn5k4dd408/91704375549.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ed2361391---tegigogabo.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/51846400571.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607303e7618a0---17909543272.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/divav.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/lpj9jujcoomhuusns68rpvrn4i/kexalowi.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ddc349644---43844120372.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/falizogogotalini.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/tefikijuxefanemexoviwev.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/7u0q2ct475kvtf0ohpmuf0f9fq/vurije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=is+number+2+recyclablePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 17044 bytes
SHA-256: 08baa6500ff0520d289bfc8305e6be3ffcdc2be668f4fbd23ce80a58bd82bc89
font_01_sfnt_off000119c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D8 10504 bytes
SHA-256: be39419b8d0c2f52f48a7d66135a6a31d5e1194b729a74521731bd61da00c39f

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