Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53b8ca1cd9dffd8…

MALICIOUS

PDF

78.5 KB Created: 2021-06-30 20:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20299933d23786b85f803925bbc5e31b SHA-1: 7c27120795b65e0f0b1ddafb67bfe921303b63a6 SHA-256: d53b8ca1cd9dffd8c2558b8f679db392459b430779344930e229ab2691f07570
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to direct users to malicious content or phishing pages. No scripts were extracted, but the presence of external links and the overall structure indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=flowchart+for+average+of+3+numbers
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/802ef783e981c6a5969d38a60746719d/60660799341.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db578ecc10---16273380765.pdf
    • http://amctop.com/board_data/editor_img/file/202106221702.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/mibajuwebokaje.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b43f344d6ae---74661042120.pdf
    • http://ji-tien.com/userfiles/file/15076540187.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7a0a39112---71831229473.pdf
    • http://au-coeur-du-temps.com/userfiles/file/28716060816.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4421b223b3b62ad8da766f5106a994bc/49321212454.pdf
    • http://ccspatti.org/userfiles/file/zinifovivisikuvoveke.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/83ed1ac5d920c679f6d5228a47f2c920/26099664371.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/7d04132f5ee6eb48ba9fd3e073a272d1/pixirefo.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160746d7d01934---64478482332.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d72b3964fa3---mofawo.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/f114ce0o1tm1msdka45hsihv9c/kaxinitenazomijilegokub.pdf
    • http://tecnoservizi.com/userfiles/files/kedezeririzarof.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5ec05fb10---90417933208.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9db70b337---viwor.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f8a4f4ae397c6525ab82798607cbfe67/pulefevikusabawudawevewo.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081169a95d92---91011945914.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b904.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB904 16792 bytes
font_01_sfnt_off0000d116.bin
bb83c1c257304f880f606cfdafc21b66106817c8712bc08ccc34b09b2afe8415
pdf-font-stream PDF embedded font (sfnt) at offset 0xD116 16576 bytes
font_02_sfnt_off0000fbfd.bin
c8955cfcfa69ca12b5d70bf3df3e7dea6d0149aa34c9ecfffc5898a25f0ff415
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 11232 bytes
font_03_sfnt_off00011649.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11649 16252 bytes