Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9dc32909b057e6…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 08:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb8bd9af7404c1ab1dfb56ef2262b1a5 SHA-1: 86f3f82e3861f0b23ad5159212be499b3baaa0c6 SHA-256: 7b9dc32909b057e6e24d427565aa06f1fc58c44d2d0021356bde25f41abf7cf0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal the document contains numerous links, many pointing to compromised WordPress sites and link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=inflection+in+english+pdf PDF link annotation
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161258fea3248c---70992799885.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/sofesowitesotitisuzimu.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/10051253042.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/karok.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/febimiju.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/al94c5e9hdq3iolb180h8qoc8u/55752908014.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/13404109857.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/20714874282.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/40361819340a763ca500b150e51e66d3/xanotamonukixizewonabab.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77a865f19---36836071722.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/1a25169bcd824763c59b965588a72ee1/78001604617.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c7eb6b269---wawevuzalunuzutexure.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9gvsb9ii4hpg6i9en25k1urno5/monulufamodefuxavaveluba.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/zijujokubajajudepivoni.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/834fc9613175f4eea1d70f26faa658f9/7839036832.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/japikefedobuzopelifapo.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dad9bc6074---43825245669.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/37430766575.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fffd065b0---bekejalamutubofumot.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/47347897532.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/wimof.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/42938064364.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d820e52b4---41069574042.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/q05b34jfn126ef42ivmsg0h1u4/45540971744.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/gawotesixemibafo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 17616 bytes
SHA-256: f54d7d9fe469c48a92f053ab060497bdc492b828aeb7a2e72802c89921174443
font_01_sfnt_off00010b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 10588 bytes
SHA-256: eb2b88c83c5141e574ae7aa7fc48b6c23bdbcdc80f472c465607dbefa0f7a83c
font_02_sfnt_off00012300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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