Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb84ee28f0d3a53…

MALICIOUS

PDF

85.7 KB Created: 2021-07-08 09:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0165b61a2353bf0c013ae3491a50f96b SHA-1: 063d5374d2e34e9ff19cca14ed7086135a4d8f2f SHA-256: 8fb84ee28f0d3a532ab929c62e8eca5c3be7427d400ae379285d81e31044a2c4
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to compromised WordPress installations and utilize disposable hosting. These links are designed to trick users into downloading further malicious content, as indicated by the ClamAV detection and ML classifier flagging this PDF as a phishing trojan. No scripts were extracted, but the structure suggests a link farm intended for phishing or malware distribution.

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 http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c212956f397---vezoguverekinegaxexoduga.pdf PDF link annotation
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/p23hkqgpr30k5l9801nq1rhbc1/87168394085.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815d5db6f45---62897814755.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a694a54da1f---9443995239.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c491fd6f908---41924775347.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/97346140176.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849ca49a496---mipaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d19b9634ea---gutusiwifajafopozovakufup.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a68750c6e0f---3369753153.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/tudinapitisujelow.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/kupefopesuzusigumakolin.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/bikomoxevutozinepo.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c986d3ab1b---duzeb.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/8dni3ugf2v1qn91khl9u16mqpr/65516821553.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a034c26dcf7---80550017038.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/2e9c00417386748ecf5e6191a1c87fea/71828965592.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/43757497685.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/21360635740.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/3125403750.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/35232396938.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/23960799156.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/lemajezu.pdfIn PDF document text
    • https://hirurgija.me//files/ziwesorabezolomon.pdfIn PDF document text
    • http://benetalent.com/upload/files/gisovi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/9vl9oojbprr2679qll0ltnd8k6/68829974659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hair+fall+post+deliveryPDF 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_off0000edd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD0 16764 bytes
SHA-256: 7acf664a917cb3e2f6db82a2983a0affdc08d41b7aaae8820cee6760da5fc46a
font_01_sfnt_off0001196f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196F 10560 bytes
SHA-256: a50d6c8c0ac671313d6c0a7bc929db538add2b7fa10dcd3f3244f3f867a765ba
font_02_sfnt_off000131a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1