Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b964cdaa977576…

MALICIOUS

PDF

92.5 KB Created: 2021-07-09 23:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a5e50f19330f5383b28939d8caaa72ee SHA-1: 4a6bf6c5e5f6d588d13494d5663d03ecea38e5d2 SHA-256: 12b964cdaa97757647b4c249b04fd8cd9be5050594d29be3eb4abc24a2cd1fed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress sites. These links are likely intended to lure users to phishing pages or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160aa51a97c988---96709172092.pdf In PDF document text
    • https://hospvetcentral.pt/site/upload/file/38113778843.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb051611dc---lekipelavometafosijiwefu.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e26aa20ba---dakizor.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/77816956894.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/736954594f11b710fc36ee43e19be8fc/89879788093.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/95305383889.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/c47387691215e67bd27c02561bb2f575/49332125076.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/75f01eabfd0cbe946628fb0e24941675/rodexisajizaxefamu.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/5cec122e74de7fe05ae2b8b9c3ef821e/66787636328.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a00f7d316ad667c74c7406c1042e35a8/22378993981.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9289e443e1---donefujejevedezomuvud.pdfIn PDF document text
    • http://ellev.fr/upload/files/wiladamarikudozetilitoro.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/36822389771.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3431d4cb---66043359792.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-06-29/images/files/46361966049.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/jaradiwifubevusur.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/2b1b10b8f033b30fa4c4dec0e800eb85/kiviganuxogexag.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/4jhih61c5volfniggspbbgsbbl/zenasudipapisusekek.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4bd7868f3---45304017550.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/bukurugewisogatufuxoxetim.pdfIn PDF document text
    • https://europartner2.pl/uploads/jikilage.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/sewaduwakajof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=career+objective+for+business+studentPDF 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_off000103cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CF 17388 bytes
SHA-256: b8ca409e1274c9274256cef4925455885c25d39211cb7acbe0b3edc06083b2ca
font_01_sfnt_off00013177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001498e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498E 10892 bytes
SHA-256: 89b3675c9f9954ab8f79cf604e24dd19db0a09ac87279c6cae953d1699be73db