Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f9667eadb342be…

MALICIOUS

PDF

91.1 KB Created: 2021-07-05 08:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04d2cbabe11130b2228c6fa2726c3fcc SHA-1: c35be574ff665c30de7afb493f3f7c4eae8689b3 SHA-256: b4f9667eadb342beaff8dba2c627d39246f626d61f2ff2cd03a6e13964e5c3af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=dimethyl+sulfoxide+transfer+outer+worlds
    • https://ooo-kenk.ru/userfiles/file/70972119652.pdf
    • http://belgium-ex.com/images/blog//file/96727599152.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b38cdcd9259ffe724a770e729710ffb2/dizawajewivuru.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2060cb1f5---powexaze.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/3ac9dea45ba28a5cf1bdc323d1953a01/59945038705.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lepitokoxerodafuzi.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9245f17526---50655252771.pdf
    • https://papiratisk.cz/soubory/53265993710.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/oo1drf3at0igblrf25folqtlc1/jarumerufuposaleg.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/2a8a9731d6ad38b2ec0a38c7d29c5697/89939142644.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/32441449496.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/be4fc07f4a59162317b73a07fdc07d31/86364411178.pdf
    • http://mgtofubbq.com/uploads/files/wufem.pdf
    • http://www.pattyn360.com/upload/forum/files/vokozefafurafuzanelaluwig.pdf
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/duveferilugagi.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e09bea876b8228ca198c2471d5dbe10a/53291774155.pdf
    • http://evohome.pl/userfiles/file/mokojirililijajuxinen.pdf
    • https://derechosenred.org/aym_image/files/gezulinose.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160adbaffedb66---wepatunobozuropowanozuru.pdf
    • http://a-mega.ua/images/uploads/file/wowudojebaludezavodex.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2f14cfc27e4c4fc40359dc1610470776/23724886560.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac404b0eb00---xobisuxekigasomodase.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f7b1c342a---59349354683.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/f41923d966907dfe56a814186d6bea05/42477488312.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_off0000ff94.bin
959df1b2940d3d37788f418597fee8f35070287c8fb571c95a274af8a25c5e3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF94 11024 bytes
font_01_sfnt_off0001191e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1191E 16792 bytes
font_02_sfnt_off00013130.bin
aa7340597b8912e62ea4b1ff003af32e2293f456f893bb03d1c5f9a4c8642cb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13130 17028 bytes