Malicious PDF — malware analysis report

Static analysis result for SHA-256 af94c397a7cdda0f…

MALICIOUS

PDF

78.8 KB Created: 2021-09-14 13:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 594bd701224d005e6ac168fd6f4adb03 SHA-1: ba2d86dc9788eb436ef324a2cb1e132d3ce189b2 SHA-256: af94c397a7cdda0f0aaa8abe87837973d2b2daf53e862589f960c1c67e4aab38
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 URIs and links to potentially compromised WordPress upload storage, suggesting it functions as a link farm or redirects to malicious sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://philabc.ru/uplcv?utm_term=little+things+to+build+in+minecraft PDF link annotation
    • https://xo-sound.ru/userfiles/file/4639581166.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/98539616952.pdfIn PDF document text
    • https://tadimtursu.com/image/files/wosakebolenef.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/sawaxofoxuwidon.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/84562543564.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/sekozebataxonikageg.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613a824ea35e0---69669627040.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/43727311913.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3a9f3c0ab---26342890599.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/24949012249.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/69210780344.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/fiwufujomebeb.pdfIn PDF document text
    • http://eva.am/files/95b137a87c1c656c.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/lezozeganaximato.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ku27nuh2d3vinlc5hop3ci052k/xizexefexazuvanusetuzod.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/1715813618.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404a8997858.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/6080693209.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/49095733813.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/pidamidowomuravatenirida.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/24336263727.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/74138575878.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_off0000cfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 11120 bytes
SHA-256: f487f31fdbd02d0b518757535438291f260b18e588b16e5f98b697d9d1e5427b
font_02_sfnt_off00010147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10147 17192 bytes
SHA-256: 0a198e3fcee05aeb6ff44769b095dbd636ebf30c9c10ffb2899762e02eac348d