Malicious PDF — malware analysis report

Static analysis result for SHA-256 d790f1eafc00f350…

MALICIOUS

PDF

108.2 KB Created: 2021-07-03 06:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa71b46c3f185cde232a1c3a7c47d85b SHA-1: c8bab05dcc4b8ece0a15de312a624cde46126273 SHA-256: d790f1eafc00f3504f6ed061f2816443ffe6680ca411e83d9e31a1ca6747fd4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/c0d2d94f541fa7f82258661b6704a354/fitulobesuvuvikate.pdf
    • https://nezrenweb.com/calisma2/files/uploads/59886269662.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/3c2ee2c7284b94c0c7870b5169fd1cb8/79368844700.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d7618036c---tekigupexakobubukuv.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/c78db672ddaffcecbde34274c555d52b/tivawiwosokisix.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/92020767698.pdf
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/2ca2caa8aed4778841a77d874a4622a8/39219867793.pdf
    • https://peterdegendt.be/file/41908580080.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/6521dbdd8dc2a144a2ecd14a45a55d9f/nedob.pdf
    • https://theelementrama9.com/userfiles/files/xutezovilojerotizosagifew.pdf
    • http://msinziniering.com/userfiles/file/suluzasoxavezelo.pdf
    • https://coluer.ir/documents/file/16603389396.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16077c6f8e7705---pevitusigu.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf65124e0a---zuzafomoduw.pdf
    • http://www.addvanceo.info/userfiles/files/67243541056.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/f7ja5n9ebmgbb4gu08f10caj72/sotun.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/77103121586.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e2b431f1d---93782521926.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/qk0tk4dfjulkmpnlli2fa4gili/24991139905.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609993df68dfd---wumijoxulorutavidesa.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/9nu6pmb0971mpgsb8vs5k25fp3/70976820960.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607277157f9aa---40475772615.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=normal+11+letters+7+little+words
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014530.bin
3db7203d8a5d61a2259008d6567e24d9d6ac93ef5c80acfa306df616dc8429ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x14530 10472 bytes
font_01_sfnt_off00015d24.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D24 16792 bytes
font_02_sfnt_off00017536.bin
976a991340b1147926459f1e0c5ba498088cb696ae7edb7c18d200aba6d0c1f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x17536 17220 bytes