Malicious PDF — malware analysis report

Static analysis result for SHA-256 abe498dfcfe3a42b…

MALICIOUS

PDF

94.3 KB Created: 2021-07-21 16:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d58abee88996113a58e8856e3dbc1d1b SHA-1: 9195aa5f89a90a30a77797cd174889bc0134f9b3 SHA-256: abe498dfcfe3a42b50a31b92ea5b83236078d83d8aef8707621a0d678c52ccaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/3ebb9eb95166ed5f7fb8e1d72849d45e/wipikusofalurujeponotoku.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2c9f9af13e---rafukiki.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/80028979256.pdf
    • http://adaviestransportltd.com/userfiles/file/lazubesosavezala.pdf
    • https://africanresearchcenter.com/userfiles/file/tibefesigokivek.pdf
    • https://karinbentum.nl/uploads/file/jomupavesut.pdf
    • https://ambalatender.com/upload/files/demavexekuki.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/7226706220.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2121209410---momefoturunogejexojebefi.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/fvhim79lm1g9l3st7svtc1vq1k/sekapig.pdf
    • http://filtrydokoparek.pl/img/all/57488324952.pdf
    • http://desagresbrts.com/clients/34568/File/sokazagurugeg.pdf
    • http://seoulmenu.com/uploads/files/38284919205.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ahjdvvu3nmpmtmv85do42hc5n5/50425071663.pdf
    • http://casier-a-bouteilles.fr/file/81371505918.pdf
    • https://weddingitaly.jp/images/file/gozimutugaxinogojip.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/salomu.pdf
    • http://wf515345.tw/CKEdit/upload/files/zexig.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/fe05c6c5e4f60028d433589f9a1d536d/begevopiwajusu.pdf
    • http://dioceseofniranam.org/userfiles/file/ropudifuxugeniteso.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda0968744---gegesavoge.pdf
    • http://bclgrouptt.com/userfiles/file/gisepexuwevixukur.pdf
    • http://thanuyentea.com/ckfinder/userfiles/files/tirikubujozasu.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a4eea17f8---kumarefatadexupitolajab.pdf
    • https://muacash.com/webroot/img/files/porejebamubewifog.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=why+is+water+considered+to+be+polar
    • 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_off00010a26.bin
d55e4b31849068a8744dae18006cbc70ffbc51c13d9d997ce9994a6f54fe79c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A26 10944 bytes
font_01_sfnt_off0001234c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1234C 16792 bytes
font_02_sfnt_off00013b5e.bin
7c30eef0e464fcb5679e094c473c9968f1ef2b54682b2c77064c1d6b294a1b5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5E 17292 bytes