Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0afdf97e321a3a9…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 18:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e8ab3896acfa1407ee7b7e783f8e90e SHA-1: e1ad023bc405a69025a72e8c946cceebee852623 SHA-256: a0afdf97e321a3a985f414861b8ea2ef0dedd2dc47a86861f769e7f8c14f12a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload directories and disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather as a container for malicious links.

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://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1547ed8be---1397983975.pdf In PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/60032372503.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efc2d1e140---2499557360.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/23947235070.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/24084234148.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/42870024018.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/rutanizerobosibizubet.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/9626d9e6b3682953ef3462dc33083c5f/32911368525.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/vagidowinevekawene.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/69386090757.pdfIn PDF document text
    • https://goodline.by/userfiles/file/biwojikilekubokosezed.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/wotuviwakulibubip.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607843eb70b07---33100984112.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e675c1e1b---56435915507.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca673eab8d---mirix.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/xozibamewomebesapebaxop.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/11720750199.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/rixunimozibir.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/34042285171.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d15b5b5a03---bipomivagibexev.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/pidexo.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/64631794830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=japanese+ebook+free+downloadPDF 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_off0000e37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 21688 bytes
SHA-256: 3a76e83c71c33c03f2eb46bb8477db1062fd7984e25b748fdaf4806c9f5ba81d
font_01_sfnt_off00011c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C21 10612 bytes
SHA-256: 8073d32a3ae04e1d980bcfa44d537fb0bc580445ac0cd7a1065a79a79a5471db
font_02_sfnt_off0001345f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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