Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da85410b2d5a6cb…

MALICIOUS

PDF

110.2 KB Created: 2021-08-30 17:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 83930ad1f945831a2e0af32f8164d6a2 SHA-1: d36d2986039580347792c019cb8d355f762eeccb SHA-256: 8da85410b2d5a6cb6866d5d8b6a2dc76d885ae6d39880ed33fa0400f81ffd60d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm used to distribute malicious content or conduct phishing. The document's structure and embedded links suggest it is designed to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://chicohigh1987.com/clients/47015/File/81225900639.pdf In PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/30283118305.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/79638726430.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/0998a00991a4efce1d85efcafef68c3e/14141538291.pdfIn PDF document text
    • https://pepsima.biz/files/file/pabanixikazakujovuwikevo.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/c023hq4eiphl2t6cccfo9djj0o/16022016691.pdfIn PDF document text
    • http://yulintimber.cn/d/files/lidotexagodabiv.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/bewobikasowas.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c6959ed16---wosofadabuxurojava.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/54478762038.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads//files/202108101605514968.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608c26f74ec56---sadafatumovukuwalumu.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160948b6156a79---zedipubamekukax.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7e8544f716f8dcddb94032a885c5f800/20484292870.pdfIn PDF document text
    • https://ms01bet.net/contents/files/dinuriri.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/jokaso.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/wisusatagiwadamivo.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/vokozu.pdfIn PDF document text
    • http://billcolletterealtor.com/clients/e/ef/efe7172bdc9c6addedf700543cb5cb37/File/116854280.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd19fdc6e5---fifazemoditikewoka.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/lilolawegofifobilezaweto.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/91465991870.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/decvusv2g48k3jtkaqj4ekup13/73450776738.pdfIn PDF document text
    • https://hagepoorter.be/files/files/kazupuzidujowawarolare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=c%2B%2B+include+listPDF 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_off00014c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C25 18084 bytes
SHA-256: 4a0dc83f2595d3caffa6d05b507f9b2d16ab18c0592db84bba9ec48460522b86
font_01_sfnt_off00017c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001941f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1941F 10112 bytes
SHA-256: 89e0ae3da4a174cbf02f88ba40866e7bf87b03c49d15bc31162185ff71ae88aa