Malicious PDF — malware analysis report

Static analysis result for SHA-256 02fe331a2970a0df…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 23:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5eef83763195920ac66a6c7eace18dfc SHA-1: 071ff1d7fac9a599a25dc3030504495bf08ebb0b SHA-256: 02fe331a2970a0df0a72b5c359693c6d6db25212a7b8d0ec55912d3b9b38da47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs strongly suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://businesslife.com/content/file/80493118867.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083c47674831---nosevufe.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d9b6fb1607304460e1422c00c52afb05/38698165323.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b01360e7e34---toloxubenegufiwasibupifi.pdf
    • http://ptaki.info/imgekoprojekty/files/41350628569.pdf
    • http://arabic.cz/ckfinder/userfiles/files/nudewogobizesota.pdf
    • https://daotaolaixesontay.com/uploads/file/25723022648.pdf
    • https://gregor-biffiger.ch/userfiles/file/83027489837.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087e80f90fae---vixepimikexewepuzibiboma.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-4/20210504180948541241.pdf
    • https://blindnow.com/userfiles/file/25675173101.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ooui87obi9ss0o91sr43or6eu7/72407378682.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4711c8a65---82403072573.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16072af5766cc0---xoxuxipemibojonepepowali.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090606483a03---80643560846.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a4ab34c01---29883499410.pdf
    • http://cn-junsheng.com/upload/file///20216883088253.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822a8adc03a---domaj.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762ca5a94d6---72045020907.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a391682ca46---vazarafafawawi.pdf
    • http://smn1970.com/clients/d/d4/d44d2684521ac238e4bdef02d06179b0/File/zoxexuv.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e1c2d4288---38011740914.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073ac4a54b31---judaxi.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2844a1a1c4c7595d3c4f470aee9db765/nifex.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/04d80836858c6f54d2ff0f1e8180d635/takegogifaxuwuvatexemuwa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hp+to+watts+to+amps
    • 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_off0000ec6d.bin
9eadcebb0d7dc49b17a1926450b4164dc40f20c2f659e720ceb5fb50252a44f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 19244 bytes
font_01_sfnt_off00011e54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E54 16792 bytes
font_02_sfnt_off0001366b.bin
7747a23ad1de394da4213ed32c22539bb309797ac338da7b02249407eb6f6b48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1366B 10016 bytes

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