Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68c74c62a3b5779…

MALICIOUS

PDF

68.6 KB Created: 2021-09-28 23:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 86798029b78de106c98333f42cb59064 SHA-1: 3fd1d3772468fd5e9a6ac00db24e444929f1f566 SHA-256: a68c74c62a3b577989e556fd0365383e5dfd099bf293abfb69dfdb5a0b14ec3b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://smidgel.ru/uplcv?utm_term=download+youtube+on+android+tablet PDF link annotation
    • http://czdashan.cn/uploadfile/file/2021091201130873499.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/lepukudixiv.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/19332248631.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/83050288177.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/duzebiturajagak.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/sqr49uinon3q87tl9dq32q13vh/7244426581.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329d3cb4434---watawapolokazisabuzutosox.pdfIn PDF document text
    • http://popmetre.com/news/files/fipamozotajede.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/wukuxibozepevulewim.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/gepexikonoxadugezava.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/96906103486.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/44176677653.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/xutafuxozerifufufitupuf.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/ruzumuxunuworowilavas.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135ae02807b3---32337814895.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161422d98b7842---jalirubovafuniguwe.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/jagepowaditewod.pdfIn PDF document text
    • https://bem-sa.com/img/file/95725524750.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/weniladobolumeviwis.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/23106720607.pdfIn PDF document text
    • http://tion.hu/upload/file/13121948632.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_off0000b030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB030 10516 bytes
SHA-256: efc92027233f1c9f54cb923b0a2523f4d2a8bfeb635d147b381cd60392b21fa9
font_01_sfnt_off0000c841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE053 14496 bytes
SHA-256: 7cd79f0b0d7dd222ff6334944927f4a7e5ccddbe17c44791702d6403148324ee