Malicious PDF — malware analysis report

Static analysis result for SHA-256 580f31a2a3e2fdeb…

MALICIOUS

PDF

86.0 KB Created: 2021-07-07 20:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aeaca99619916c418c903bb1710abea7 SHA-1: 19c43ced0018cbebaf40727724c1230d65a1671b SHA-256: 580f31a2a3e2fdeb0b8cf41b0db6545adccb62aa7adac85af67512d0391276f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to PDFs hosted on compromised CMS upload directories, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfb75af1b9---6334477936.pdf
    • http://peaktoppet.com/ck_imgs/files/22028843597.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/pceqbgotoe2kr42ipdjavibtvr/maboparo.pdf
    • http://www.centralperdana.com/file/62464511662.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/mga8hjfe7n6s7f6s9igjob5gbt/22867144058.pdf
    • http://pcccmiennam.com/media/ftp/file/44639713242.pdf
    • http://temple.mo/userfiles/file/jagaje.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceab712b5e---87555409604.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/400390f59d583d5b85aee70817dcb431/lerudizaropakadewalefebos.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960f4ae00a2---43315211611.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607133d14a685---96666714302.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609157f75bbfc---62644750910.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6197b47008---61539548271.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607957643e063---99033284883.pdf
    • http://orosweb.hu/ckfinder/userfiles/files/judesapekoweg.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609107f4de874---19167154792.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160745ee4ed9e8---8193727952.pdf
    • http://faw-asia.com/image/upload/files/wumosu.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6ef234681---sowededezalokovak.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e075158a0---kapetejajugudipilodaw.pdf
    • http://3xlove.com/uploadfile/file/nilixutatevedesekibimej.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa249d410---gotakulijogug.pdf
    • https://baxsporthorses.nl/userfiles/file/96876955239.pdf
    • http://jongauger.com/ckfinder/userfiles/files/jesokovedafef.pdf
    • https://csodamalom.hu/files/files/pavavadufajatubusurik.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=another+name+for+rosemary
    • 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_off0000f00c.bin
361a51c65d97ddda2727a2d363b34946b43d7fdb8cf947c47543999bd7720d33
pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 16600 bytes
font_01_sfnt_off00011b1a.bin
7a50afdbb11a11dd5f45ba7ae720b6710469202f220d0bc20f6fb38569cf605d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1A 10436 bytes
font_02_sfnt_off000132ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132AD 16792 bytes