Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1949f09fd6f0a0…

MALICIOUS

PDF

69.3 KB Created: 2021-10-04 10:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d02412eaa64de1daf178b334b3ca8239 SHA-1: c6677b1bb64a7d9a5c1a0b1f7501044339737aab SHA-256: 9f1949f09fd6f0a01dc9d1eb769a41f9f2b1d62b04e895fe44da8805e3302618
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://sysquare.com/UserFiles/files/43741376050.pdf In PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/27882639777.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/5ks0t11r7jr402shrbpurtc8q8/diwavobusaj.pdfIn PDF document text
    • http://hybsch.it/upload/file/jefalazifivitemufitogaraw.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e110041a9d---xegezomibalox.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/karijapomazore.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/sonojiru.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109281722018797.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/29062071236.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/66778339683.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79983800298.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/99067076782.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/66957401606.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/50608252920.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/nemoxudidiv.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/49183166780.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/jexavemotamixete.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/65461226710.pdfIn PDF document text
    • http://szhlfz.net/upload/tewivaf.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210908205303.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/fiwivizekirizurebevamu.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/78583170391.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/roguturepowexepijaviluziz.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138463409503---xojaxusotuzuso.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/nepolebuvuvudabibixevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=codominance+and+incomplete+dominance+examplesPDF link annotation
    • 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_off0000b1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A6 10708 bytes
SHA-256: f13fdd3fc4fef5c710073c31bce8e10d7f82c7765a2cb39f949f6cd94685b5b7
font_01_sfnt_off0000ca3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24C 14856 bytes
SHA-256: e221d18debc5e97690fcb12aea1b1d99f684fcd8c1be947e8fb0b0eb67a86b5c

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