Malicious PDF — malware analysis report

Static analysis result for SHA-256 1deb1a1e6cd013cd…

MALICIOUS

PDF

70.0 KB Created: 2021-09-24 20:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 043dfb2ebdf1c454620448141e454b2d SHA-1: b44515703121ff9ceb03c9a80d93385bfc172bfc SHA-256: 1deb1a1e6cd013cdec584a8b30c8a79c255b4e0cc05a78fc6ddce412d5be738b
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, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to potentially compromised WordPress uploads, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614137a904ffc---mibajonadizeninunu.pdf In PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7b401f83d503dd18c417959a5017ec73/91577447921.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/mikagazizavigade.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/42334886277.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/xumiputufoxaxoburifiwoxaz.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/84020389693.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/tuxenisabosezupifa.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/niwupepu.pdfIn PDF document text
    • https://magerp.org/upload/files/gitotafubagagemizijipuses.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/10725238266.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0c8a4e60879acd91d8b12d0b423aaef5/miwurisuzamutigemiwoloxu.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/70950911729.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/goravolexiz.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/bujomesideju.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/gegitulezawofijote.pdfIn PDF document text
    • https://tebra.si/userfiles/file/40392619380.pdfIn PDF document text
    • http://digifast.cz/userfiles/lafadigunowogekofifutem.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/0e867e727f101858f92536289c3dfe71/83153655465.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/l3qnjhp7fn9oe9v5lg2nh1cch6/11494216874.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/lawukivogigavubepa.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/tufogatowubovosu.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/wunipobozizajafukaj.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/33108305076.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/bewovasolitumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+football+games+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_off0000b152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB152 15880 bytes
SHA-256: efc67ca93d0a04a6573a3a55830e2897239b29cd6e6c26f9c47f80009cafe92d
font_01_sfnt_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 10808 bytes
SHA-256: 04944632f2b8e74b0110ab2ee624290781286681c44ddfb2d938ac9bc379ee99