Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b20bba89d7198c…

MALICIOUS

PDF

95.9 KB Created: 2021-06-30 03:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f25fc22c0ff0f97f121fd7eea5c73476 SHA-1: 89454031f8e7b65e2273eef5801de4b73b662229 SHA-256: 40b20bba89d7198cc3b29041c78c97516f3c287fa592d9e202f4e598cfe1fdd4
212 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The presence of a visual download button and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a secondary payload. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mecaniquekd.ca/upload/file/bowobegirivigun.pdf
    • http://cuatro-pr.org/sites/default/files/file/8120295518.pdf
    • http://billedbutikken.dk/articlefiles/file/99113547740.pdf
    • http://schokobrunnen.com/idata/romufetoziluzanut.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099d7bdb46ad---guzetixal.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160702ce9af9cb---2783124909.pdf
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/pibetadaperepalo.pdf
    • http://tsutae-f.com/js/upload/files/gafebumebuda.pdf
    • http://df-foundry.net/d/files/gepufidib.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c888850a0d---82729907805.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c7d7ad0500292617b413f0d70a68199d/21800437575.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a850fa732c---dunim.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/kb61e32fsece5vf9lmtqblbq5c/856537373.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8f0c004f3---28268030034.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607524863bfd1---99453154676.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fd4045a8c---30019455024.pdf
    • http://stardentalcare.org/userfiles/file/17473340994.pdf
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/15290325069.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cdfe1bc08b0---rudorenudupevupegav.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/f0148f3d9243ddbddb38d698ecd6dddf/9554052901.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/20024009189.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/75g50njalsvu5pj01686vudia1/98808862094.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4a90d9a5c---sazozuvugumikerodawifis.pdf
    • http://e-sportis.com/images/upload/lurarazufebipavoligari.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mile+ho+tum+humko+mp3+song+download
    • 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_off0000fa52.bin
d4dab3d425a848480131338486f3983ada184134227f0e13bfcc80cc5ea3c61a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 11184 bytes
font_01_sfnt_off0001142b.bin
fdebfcc764d58e88c0200ded5b8f348aa19d1b6f26a8c3ee22af1abfba4004fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1142B 17956 bytes
font_02_sfnt_off000143c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143C1 16792 bytes
font_03_sfnt_off00015bd2.bin
dfc4638d2e007909ffa0f33d53a380638a8b530fb86d4f784fed66edff282ef8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BD2 16276 bytes

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