Malicious PDF — malware analysis report

Static analysis result for SHA-256 91060c9121263492…

MALICIOUS

PDF

86.6 KB Created: 2021-09-14 05:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b8a1bf9c36565e18356e98cc08d2a69 SHA-1: d420552f9f9f1a93462914e6e85d4bf1ec8af17c SHA-256: 91060c912126349226123e22f56199304897314f3a2e9cc4b34b8996cd0f84ed
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or are part of a link farm designed to obscure the true destination. 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, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://banghenails.com/upload/file/mewizuwoxeziwalav.pdf In PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/62907533502.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/20783126938.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/21070093455.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/43178632141.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/relanodumito.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/namusij.pdfIn PDF document text
    • https://chp-travel.ir/data/file/valeselubugiwofo.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/92159230286.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/bixeputob.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613440d320905---rideduxurewinapiwo.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/b405rprehkf02l152jpmqk1ds5/jusuxas.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/228bf393a6e558d6a70f21d0e5edf1dc/posedajinaxenewolowadavar.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/88700937021.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/kaganidiratelokutoxu.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/selepidisagiraru.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/75013659789.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/vakesudanedil.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161391963431aa---10903894941.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/37133812576.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/kijelakolopapurojuzipe.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/soduladat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+automatically+save+pictures+to+sd+cardPDF 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_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 10928 bytes
SHA-256: 54a86842f668e7f91e18bc89101d1462ab35b2c87438664c04c89ddb8cf59cb3
font_02_sfnt_off000118a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A5 20128 bytes
SHA-256: d305e5baca6b550029788d1c72d91e311da9c55358d9c58b70daad98d192527d