Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a42b2904b55ac2…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 18:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8175b2d902187dcaae1e6d4042a7ef5a SHA-1: ff8da5e807e098f46d22af594a23e27ad8cf96cb SHA-256: 49a42b2904b55ac2dd951bfc5db36663874ea961ce51e80b637089e7fbf3b0c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of link farms hosted on potentially disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs align with techniques used to deliver malicious content or redirect users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=bone+marrow+structure+and+function+pdf PDF link annotation
    • http://bioscipublisher.com/files/upfiles/file/86220528837.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/wivaxudagabamug.pdfIn PDF document text
    • http://zubrcup.by/files/files/lulawezazaxezekuxup.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210701_ABB6B0B03DCF168C.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/fexamebugosovilobezifutij.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/23396091010.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/zorebajolobodabogadoja.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/wusatojelar.pdfIn PDF document text
    • https://aneri12.cz/res/file/kujonimisakibufoginozor.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/25e129e32ae1a06a87e9792aae41ce1d/17773171283.pdfIn PDF document text
    • https://magatek.com/documents/file/22740465323.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1610021e7f36ce---luwotusazupiwoxexovuxub.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/14250365749.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/pmqb8uba5gpajk1e4fk2bh7qup/36699072782.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2fd74663a---76380636701.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/6495400686.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/nejurinodej.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/34394524614.pdfIn PDF document text
    • https://ms02bet.com/contents/files/sotafese.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/58976733392.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607feb7df2ad3---28700185142.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/59edf9182332bf416f3bb147aeafdf5c/niwitupugenelag.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086248e8cfa8---furaxasavonuwobexamelin.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/80985490500.pdfIn PDF document text
    • http://usateatop.com/_upload/files/jutozomozudokimisen.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/16966289006.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_off0000e40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 16608 bytes
SHA-256: 11c90ce29fe682d1d6f4df0767eb0ce1b51f772606cd46f608d7f0c6176045fd
font_01_sfnt_off00010ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 10976 bytes
SHA-256: ec53d9067027f88f4e32ecff04cc5d99c0fae647df22f36b932fc93ff9acb38a

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