Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d43576eab1e5c67…

MALICIOUS

PDF

123.8 KB Created: 2021-09-04 23:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb7e802c9ffc855c81856e0491a422d8 SHA-1: 98cf70108febcaa1097f2a53a7b5fad7b9808bd6 SHA-256: 0d43576eab1e5c67ab34fa32a1b3ff64715eb51d2add8759904f72715afa09c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to PDF files hosted on compromised WordPress sites. These links are likely used to lure victims into downloading further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2609

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a2c3f47f229d90434d593766a07f89cb/63533591578.pdf In PDF document text
    • http://apluskleaning.com/admin/images/file/lelatit.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/22195941450.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/j2bfp7p4asc2a0qak6tjtl9rk6/57677200879.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/9d2ee05630b799e3378dd6dab32ebb91/59458529589.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ft41em7jkiunokb9dksoceo8u5/sokolozuvinudaropagojaka.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/239be1ad9876e19f2b2c685a687da7dd/33689657250.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/fofinufiwipajog.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/93118204966.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/46656917966.pdfIn PDF document text
    • http://espokebar.com/uploads/files/48507135709.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/82ea5b63126e2ba7133ca800c16dca5d/ropasudexutalikefoxidefe.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/a5057043e81595bfcf3830e9dfc94932/mijagowuzivotesoropovis.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/vevuwajak.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610609f559e17---bapegomuwulavofoxuj.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/76210801342.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/jufuluzasedulevavanarabig.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b784ddae2bdb6f5077a521f8527cab59/16387031896.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/28e940f6bf4940bfb934954a63f4890d/nadefojisapab.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a14419a21---waxedesujosot.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/bozot.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f47178bae96fefad5a237b92c7602794/ziwogevedujetupulagid.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d45bc9a32d0---40777998312.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/migepaxamin.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/185s6lp9cnauk0vmkuvif80mbv/32611935478.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9371369a8---65726388909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=l-tec+mig+35+wire+feeder+manualPDF link annotation
    • 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_off00017d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19571 11016 bytes
SHA-256: 926c884b1a70cc7f886d797b4ebec7c376ced6b637c849335604bd68ad045f7c
font_02_sfnt_off0001aee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEE5 22288 bytes
SHA-256: a94ffd2e7b40898bbe6884b967305d07b8487dcf369a6aaab981b37c7f047e0a

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