Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7b6cd3870cedab…

MALICIOUS

PDF

94.4 KB Created: 2021-07-21 07:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e483bd56ca778b2611a152a4d5ddaf6c SHA-1: 77bb299612183eefa5bb01f8586ec7dc2fbfbb9b SHA-256: 0b7b6cd3870cedab600c638cc25001f0912e63b0010195cd90283ac01b368e1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://exosportsante.fr/ckfinder/userfiles/files/dovetederu.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2902d0f4b7---xepitasagodikaxavudem.pdf
    • https://moraure.net/js/ckfinder/userfiles/files/72046963044.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088efebc0f74---nebotuvidunivob.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n9q89usvn0o2n5n59immt08jo4/78111173294.pdf
    • https://tarzminder.com/resimler/files/xixinusuvavix.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/983d5ffd19bff2317bb9cae722c48ee9/kokedimumalobuje.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//xegatudejudigoze.pdf
    • https://chp-travel.ir/data/file/54961222950.pdf
    • http://gold-carsales.com/js/upload/files/41644377.pdf
    • http://kovacsoltvaskerites.hu/images/file/mofomuku.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc43de8bd8---zifugakopikox.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/73d6ae080e25db8f17f6a983fe362185/ranagori.pdf
    • http://biblioteka-belzec.pl/upload/files/20207069443.pdf
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/zenotovetapiz.pdf
    • https://anfauglir.com/images/file/zupavesopaje.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4ec057a8b---41233391529.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/35ac0e458cf44a23aef36f6e6402c075/vawepag.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa75004578---mizisoxo.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ilmug50ijgu8i579sksq3kstup/lifijafasebazitovuzon.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a47fd09e527---36803571359.pdf
    • http://adbuffalony.com/uploads/files/fevesuloj.pdf
    • https://osakadentalcare.com/contents//files/21815829700.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tcs+pl+sql+interview+questions+and+answers
    • 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_off00010c89.bin
fbb89f52d6edc2c829b8eb6c33ade0404da17b311566d31f4313a03617cfb24b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 17792 bytes
font_01_sfnt_off00013b35.bin
838829510cdb5d39c158a3964ace88b06d41e2e9597e0e9a11a7aa2260621d1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B35 10868 bytes
font_02_sfnt_off00015449.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15449 16792 bytes