Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb3a56dcbb02b7a…

MALICIOUS

PDF

100.3 KB Created: 2021-08-19 13:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 000b6a2afaf44017ad11e00ad57722d1 SHA-1: fdfd4b4936bc77cc3e783537c02f642db74115e3 SHA-256: 0cb3a56dcbb02b7a47c406f5651c4aab2a4858c9f4b09a3461055dcb995aa960
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised CMS uploads, with many distinct hosts and UTM term redirectors, suggesting an attempt to distribute malicious links. The document body was unreadable, but the overall structure and URL analysis point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af957e3f6b9---volajasinosidud.pdf In PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c277bb04697---nujudutedajevojejibusaga.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/6350192638.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4a1ff2f16---toponebow.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/0ar2kk6fat4enp267ue2hni667/78752421967.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a6148504e---15490985232.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce5c2e2fa7---17030492013.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/83c36d58d4b537f39c549764d1475045/69951439414.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/70442531606.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/12372584966.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/zipobobibejogaxed.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/c4d38bc8d119d029b1da022c93303db1/76079901737.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/96827718816.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/15114360361.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107190321044559.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/10385ae0404451bc2810a5a8ff29e857/70477940312.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/15947913083.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/f9432597668583b6626e2fe18b855e28/sifokavuxarorimigaposa.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/8b9bee67fc4d449ef31c2de9706c9033/80850181346.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c36a64a9581---82358961588.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/24409483004.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/xumirebipitilewulesib.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986193ce3a6---14932538970.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/sawufesurefab.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/flqanvkijsimd5cekrevm5m6e6/fizajon.pdfIn PDF document text
    • https://kaimano.it/file/jagudofugedirin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ejercicios+complementarios+tercer+grado+bloque+1+lainitasPDF 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_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 18876 bytes
SHA-256: 30374a00f9594a30bb2582fce1ac7b9ea271d5578a056bc25e26b0082359bf62
font_01_sfnt_off00014da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000165ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165BA 11408 bytes
SHA-256: 2ccf8dda51ab7471bf6cb03e989b35281cf0b75066a2e84f9c0a64bd6996925c

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