Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a5446bf7dae33c…

MALICIOUS

PDF

86.9 KB Created: 2021-06-29 09:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 767d484c559973b5641647bd5bec148b SHA-1: 961900d6b85370fae8bee352fe2b19d1f8fc3b7b SHA-256: 16a5446bf7dae33c6482a1bab77a68c584775e39d3c20fb5d8a3b253681da23e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=network+monitoring+interview+questions
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b21a73b5c93---6927626238.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/lubiten.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0e10519e51f058400263154cb98e7b9d/bevexujezadigavuvobo.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a07d1196937---99293704293.pdf
    • http://abwva.com/uploads/files/gofujufuzunitamez.pdf
    • http://spreewaldatelier.de/img/editor/file/jefajogikowefiwaf.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f9741776bb49fe172c59c5133f7f392f/zizozabu.pdf
    • https://goooinggroup.com/userfiles/files/20210619_012636.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d49e573a61---45920884066.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b72d70962---25958699398.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-24/20210524145717228308.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5ac96df18---78274019543.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/f21b97805189e9e8b38e85eb11645e3e/2858162300.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f0c5237dc---juwisalizevefenolavogad.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0a69a533d---guwimulapadexif.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b870d137679---72523606711.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086899171a31---75409843195.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/a385bb29acff617fb3f0a940fbcbc5a3/99830885146.pdf
    • http://fedoro.ru/upload/file/97639959103.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/wivawusedefivagel.pdf
    • http://ridendo.cz/files/file/53198824849.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/l522fqsho2nh1r60to3ev1f424/panevipizi.pdf
    • http://evevoyance.fr/adh/.-/file/9015171067.pdf
    • http://maslag.eu/userfiles/file/89906367554.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/591ca0590109c9a9e7b4abacf9055ffb/13255320848.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f303.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF303 16792 bytes
font_01_sfnt_off00010b15.bin
294c812a48ae27a4f5514ea3b6eea92e2439af17d239808ed8a67a7423078f9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B15 16856 bytes
font_02_sfnt_off000135e5.bin
c17d6aef250bfb1093ced3f4ce7ff2ff5b0119677a50aae6d7347106fc5c9507
pdf-font-stream PDF embedded font (sfnt) at offset 0x135E5 10708 bytes