Malicious PDF — malware analysis report

Static analysis result for SHA-256 622d70933d7ebd80…

MALICIOUS

PDF

105.2 KB Created: 2021-07-22 02:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4f57ff41a7c3dd41cecf285eb476f62 SHA-1: 34435722129eb7d76b72ebe275094222b2292ecd SHA-256: 622d70933d7ebd80ee75bce52800c72e9f5f5ac1c96b1d6ba398b47543cdb59b
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories. These links likely serve as a distribution point for phishing or malware, attempting to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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
  • 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://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607746d396362---68194797621.pdf In PDF document text
    • http://bmcnx.com/userfiles/file/90692623969.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1077fb35a5---domimowena.pdfIn PDF document text
    • http://mebco.ru/images/file/5793310556.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210618094246_jrrvun.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a62423cab1e---jezubowepisuxusekag.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/rufosuxigidowitokeronax.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4cbd5438074b7859e50a125d46b3b035/vewapatexik.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/gikesunimijepawewesubolu.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081900f6348b---99339283448.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/94429604287.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/lozugopelejebefinaxetopo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973ad1a9287---19718059701.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/26607526103.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/54302613722.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/daralelatugas.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/e84f83782b4548d3ea26c9418791d46f/rabefedidigobaretojajoda.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a9eb5c1f68c0cb6f20525c845d7849b7/52750250608.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8079ed0c5---7537833845.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e5239124340---fisumitimijakob.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607618d5bd513---diratironujeronofumipaf.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/81319349855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=meaning+of+visiblyPDF link annotation
    • https://mediaget.com/userfiles/files/xumisilavulixiluwadad.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010d6d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10D6D 28896 bytes
SHA-256: 21f59abe634124a11f2941644e26474f22911aaf9e73a7724b8ce715d2f630ed
font_00_sfnt_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_01_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 10504 bytes
SHA-256: d7328865b16f6e579e7e222bc59f272b381d88238a0139cf3f33daf48110b005
font_03_sfnt_off0001426c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426C 23608 bytes
SHA-256: c1ff631912d2ba97b025a61da1670ba379d118635ea3177be999d4cf165bd9d0
font_04_sfnt_off00017cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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