Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1dab936c9d6fddf…

MALICIOUS

PDF

480.4 KB Created: 2021-07-02 09:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 506b2fb74259ba8c317addfd9acb4279 SHA-1: 7e70a0acb5cbbb486682bb634e9c06afe959ec37 SHA-256: d1dab936c9d6fddfa0f8190667677c2478a2a85306b9abeec6d2b20c364236f6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains a link farm pointing to compromised CMS upload storage, and a high-confidence heuristic identified an SEO redirector lure, suggesting an attempt to trick users into downloading further malicious content. No scripts were extracted, but the presence of multiple embedded URLs and the nature of the heuristics point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8342

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://lev-steklo.ru/userfiles/file/bajavidomutewed.pdf In PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b212481820---32260314532.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/ed0f386c51c59203064ad05660184cd7/tujuzape.pdfIn PDF document text
    • https://superpart.com/files/mewalagilim.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/92811690889.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/sazosamof.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/8m3vtfaoqunhfq39j5i7tev2kg/37392307389.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/86723e6d8d1810e6e91f88c29482ce19/77691497502.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/40449161592.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/450729ff79098f0d73b57a93aa2cf881/kodorifonuwa.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/jafisob.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d6b960a4b---retuvivinitelazipex.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xadizowemovakuse.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/639984214.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/gopolusekajomarufibodup.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/lekipoxarakipewesodizivi.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/399o69jhapsp1s11j7uags7n4k/baxolor.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/43718876827.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160acc10311a31---velevesezifalejenadojibeb.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/fdb48bdfefe2dadbd41fe2921eef72d2/gavusutokopenaponuxogipe.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcaea14bf1---45424927237.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/049f4d2149699bac1e3bd45ceef32627/42421000023.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/49571822431.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/40082769574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sampling+design+and+analysis+advanced+series+2nd+edition+lohr+solutions+manualPDF 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_off0007026d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7026D 21884 bytes
SHA-256: 7ef728965b36edb4b219cf8cc5efa2a589e7cd36a96d98c5ba0d0f446718c972
font_01_sfnt_off00073bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73BEF 11436 bytes
SHA-256: bb2c1ffaa828d5eb760dbfaa28cb8492e63e2159e3bcb70b7a700833ab9f867b
font_02_sfnt_off0007569c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7569C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1