Malicious PDF — malware analysis report

Static analysis result for SHA-256 2301bb4422f89ab8…

MALICIOUS

PDF

107.4 KB Created: 2021-07-06 12:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 97e5b93b36c4d06f67c6e5604aaf20ea SHA-1: f4ff43ff53ac639be9e9638b51ba1869940e8067 SHA-256: 2301bb4422f89ab83ed7563fa37d5b772ac05ecc07ae51961eb60eb747613004
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Numerous URLs embedded within the document point to compromised WordPress sites and other domains, suggesting an attempt to lure users to external resources. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e88e78487---26189431940.pdf In PDF document text
    • http://modern-pro.ru/files/file/77887822399.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081133e29e07---kumoxerexoxakebeve.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5814daa9f---71228956747.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/l92snfu1i8ecijd3ua5uiog4q1/garakaname.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/finesapibe.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/sezasiga.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/23167841577.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fda00d669---pubimagoxugitixusixukani.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210618190910944.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/ftb2873g8lugluv80lqml5ujct/gekekapapugaziduse.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/b622c7b6174dba79fe617ba0aa0550c5/fanemorutarowebigisowir.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/84c24013be8be803842e2ae445f6c0ca/79969307130.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/wuvadunuxomakaxifog.pdfIn PDF document text
    • http://canvangdientu.com/images/file/somepavojerujikuzera.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9b1a3818a---bizomorubenuvigeva.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3979760c---3021841796.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608687d8290ac---92543564985.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/bixiririxozegabazubiwilo.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/81280147761.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab3111025f---koromavo.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/0a99ea99fabf441c209407a439fd2412/85415783392.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/m5itk7oocib20b5d08gv15203h/74167114530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=non+inverting+amplifier+using+ic+741PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1C 11148 bytes
SHA-256: d37cb930e6112bc944449dc36cfa4bf7d15a14d7458c6d4c83e5a4570b27724b
font_02_sfnt_off00015955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15955 16156 bytes
SHA-256: fc957477e3397040f94da30bc5be63e085c51646d80411e031f970d1fc3dc2b5
font_03_sfnt_off00016ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EC8 18384 bytes
SHA-256: 6105cba0ed9efa7eb8055f8f4779997ab45de983f26e208620c757ee694e071d