Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d40b0273f5751e…

MALICIOUS

PDF

90.4 KB Created: 2021-07-30 04:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31e06825d22144f103dbac96e59ee21e SHA-1: 9b4f7f390e96bdd7d9aef5988aa078d76ae694e7 SHA-256: 88d40b0273f5751e605413ea937228edb11bdb500ff466057074a1a7d8a89bed
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=why+does+my+wireless+charger+keep+flashing+green PDF link annotation
    • https://allcreaturesinc.com/files/files/gutawogufelirejako.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/xawowiwadafuvagolidewuwig.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f35c131d07---34009972370.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/dowiwujebusixunaxigeju.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/neretos.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b943e1a941---99838301687.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/ce75ee792c4e3316e8fbe79fd3d16ff3/76488649826.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/a94732486190973d222700f575b640e4/98654687486.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7f349b79788d0f9ce2ae6e85498176d1/falowitiravelitunib.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/9271853150.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ep89bhu0q6a3kqait48b3p6ti1/jogiwa.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af4b6f0dce4---bofenatuti.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/webifarane.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079f5825c4fc---tidonixotegetavan.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160863146ef2ca---gorajojadutolimexe.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2b088033b---xotameraxer.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/kabajizetuxig.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/20767898038.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/fujabolojunexamotavus.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/potufenil.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931c2cec10e---lidexotusemavora.pdfPDF link annotation
    • http://goodtraefarm.com/ckupload/files/kizovovoxiladokesevi.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/77216577006.pdfIn PDF document text
    • http://pro.ovh.net/~tribuene/images/banque/file/bevidukasewuz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF736 11252 bytes
SHA-256: 3848231a0bdd757548530fd1e2d20ea941f57084cf8feaf3a9c69fce7ccae8c4
font_01_sfnt_off0001113a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113A 18552 bytes
SHA-256: fe59cbc1945842d52b700f748dc54a948f44aa18d43792ce9303a884146a7c87
font_02_sfnt_off000141c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1