Malicious PDF — malware analysis report

Static analysis result for SHA-256 374b3656a1f3609f…

MALICIOUS

PDF

88.0 KB Created: 2021-06-29 08:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d219f859e637ff8d24ebda95c2e26c78 SHA-1: 980f4f5f7f57dfa385b489ef78b1d86c30c62f88 SHA-256: 374b3656a1f3609fd462a43d6f6524c389143060ede6f39116ffeee38a165daf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload plugin directories. These links are likely intended to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF being flagged as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607eda8707c12---toterosixiredulowide.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160984006dba94---dedenopanalogu.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/4iettjjctktefafu1m4ktvg0ks/27443714154.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ca4f7f74f550cda0598fe429fc41a060/6308009233.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ajs5afk8njur8k8bd520uvh54e/winezibezavovutefov.pdf
    • http://toyotaquangninh.org/data/dulieu/files/gidepefaneseto.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc2e0c093a---1057071331.pdf
    • http://drapa-technika.cz/UserFiles/File/lipusaxisejatexo.pdf
    • https://cr2tek.com/userfiles/Proj_Name//files/barinuzovobidelofasidubog.pdf
    • http://amon-syotengai.com/userfiles/file/39959897827.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083340d87de0---12837427637.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081affabd537---kakawapuba.pdf
    • http://ceskylakros.cz/userfiles/file/77935307289.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746bf4d9a7e---zidikuwawetawasude.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5be99994afb1aaf663896acb18c5712a/fipajewi.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b185835e0b4---sopikesulopavuvopomefu.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac20082aed7---17492423169.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d46ee8143---10991892837.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add88e9911c---biwenesagulu.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/70415492271.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/lokow.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a737810db16---85978740958.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/torisofenobiroki.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083678d03c7f---gakijozexamarubarizesam.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/cc47340c378cfe6e7910bcf5602792c3/fupaloteviboto.pdf
    • https://shrink.im/a8KuI
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=foreshadowing+in+to+kill+a+mockingbird
    • 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_off0000f368.bin
e28a74ab5f1037221ede81238748f0a9e14b88f637b04642588ba2e35607488c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF368 17400 bytes
font_01_sfnt_off000120bc.bin
918ca9ef0ee32261fc3e8e1e723d21d402f4950354151cae86272a67fb330187
pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 11112 bytes
font_02_sfnt_off00013a50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A50 16792 bytes