Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba43f6cdc73f4837…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 05:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a999f1c4b3fd93104b774365b66d8a3 SHA-1: 91d7cbb1cca3df6e0398437934c0f7f6bc08bde6 SHA-256: ba43f6cdc73f4837838167ad6b28d024068dfeb888f24a18400f59b4ce5ae56a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It functions as a link farm, presenting numerous URLs that point to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to external resources, likely for phishing or malware distribution, rather than containing executable content within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d9ec09a41---siwosudofetagojud.pdf
    • http://tatugigo.com/ckfinder/userfiles/files/vufevowawulenajogoje.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8daf3845d8a40e1fb3b79a63bcea5d46/61914125808.pdf
    • https://agrimal.pl/userfiles/file/96439275978.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/027e59ad1ab4d795880c52397b5137b1/muxipegimeti.pdf
    • http://guides2alpes.fr/uploads/file/mukobovinunum.pdf
    • http://dush-kz.ru/uploads/fck/file/98777113509.pdf
    • http://phayaotechno.com/UserFiles/File/92325936553.pdf
    • http://netinflux.net/userfiles/file/kazebilepegiko.pdf
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/080f7590dc6cb0edb2c2a5a87d0ce9f1/4377439544.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134867495865---29271262156.pdf
    • http://moneymaker-gold.de/files/56789582742.pdf
    • https://cailux.lu/userfiles/files/xesamibabufovugijix.pdf
    • https://barrierball.cl/ckfinder/userfiles/files/nonakobidonosoranatu.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/j7gb2icafupffiainv2n8c0tjk/29355078804.pdf
    • http://dlzj.net/upload/files/20210530230134598387.pdf
    • http://royalwedding.jp/images/blog//file/68355792438.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/49940237108.pdf
    • http://atol-res.pl/uploads/file/26597571657.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/1d3df5313cb019c62158be1e325a6caf/gubifaze.pdf
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/rezabarukonorefisuzemafe.pdf
    • https://fzclicks.com/demo/files/editor/file/tuxiwenogagazefulofe.pdf
    • https://mojer.bg/files/24004866765.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077a04c349fe---tizasigovawapuw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=practice+of+reservoir+engineering+dake+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_off0000e23d.bin
b74b2cbd3ff38d38e200b8526508a582630162a8e3986b027d343e6407cc5dc1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 10908 bytes
font_01_sfnt_off0000fb78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB78 16792 bytes
font_02_sfnt_off0001138a.bin
db525f0ade641e06da90fec926b8c6671255004b223c05f419abd2f87207418f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1138A 18188 bytes