Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc4c88e2be013dd…

MALICIOUS

PDF

120.1 KB Created: 2021-07-25 11:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4f87f5199dcf67a1736e520285fc9803 SHA-1: a075563dfb34f0425ba9748962b8e7ce7a26c019 SHA-256: 1cc4c88e2be013dd92486a559dff3cdf348abd5ae2ccaeac08384bcdce9e49d1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external sites hosted on compromised WordPress installations or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the link farm structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://haumeaonline.com/userfiles/file/56032766409.pdf In PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/29020670000.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/cfac36150df9bb722970030ce972802b/wudoguzixamalaj.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/xidixulativ.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4890276056.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092bdf6cef43---minoro.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/1039d78f7a2875cb161b37dccfa30cb7/pemotefepavowodapufoneniw.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/4980367082.pdfIn PDF document text
    • http://sparkpro.lv/content/file/xubinegesofezekururivo.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/60265194559.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77671463df---tagimudezutosagiraj.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750a470f33b---5342179946.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210603150331_3uuvpk.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/bd8ef775cee181d54dce4a745ea48d2f/watuvukawasazagutinamito.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/9646698260.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/todubewifobukapu.pdfIn PDF document text
    • http://www.samlab.com.tr/wp-content/plugins/super-forms/uploads/php/files/c849c8qian27qon7dmvhlqok5v/28132536564.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978998841b3---rumifa.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093f954eded8---90661355888.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9a63c1e85---kazijojed.pdfIn PDF document text
    • http://sparkpro.lv/content/file/53734285676.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8108926c50---93351440315.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210721_1A718BAC656A98B5.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+measure+bowling+speed+in+cricketPDF 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_off00017109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18920 11264 bytes
SHA-256: 149614acab0a81e2b0000a23aa53aa58572526c63f2eaae9aaa02d1c26facff3
font_02_sfnt_off0001a325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A325 17524 bytes
SHA-256: d312c92a40f001eb819420339f9e913af3ec15bbebb4562393af5738bd7ad1f9