Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab5ed831ebad895…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 18:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f955c98a80a2d65a567035361c55d92 SHA-1: 0e71afd70a132550f89fac02b8675d0df03187ed SHA-256: dab5ed831ebad8958654f98c6def6fca69b91c2cda82cfc5facdfc687bb66d97
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one URL indicates a potential phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://queure.ru/uplcv?utm_term=car+mechanic+simulator+android+apk PDF link annotation
    • http://cascinamana.it/userfiles/file/65570097054.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/31200719603.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/13858629917.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c070a65b7---wogegujabuvap.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/kiwetoxugomomisalijukami.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/selamixatovik.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/4530593957.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/fijedilikojokexav.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/jewezutitepo.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/99612928039.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/49149853945.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf429d1bb7---kuriposegof.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2ce45ded---nawelapopadejowofazos.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/balojojikiwipukot.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/85231885563.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210906215552.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/ravelujiw.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/tukelexus.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/pogamad.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/zagiwakurojobufive.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/vobesi.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9617b83dce6b19ae962a38c082176e35/puxibakanivofujanuzu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD548 11000 bytes
SHA-256: d9f240462c0261618439927f0b3c18851d6c88952007d74899d067673dd2f448
font_01_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 17908 bytes
SHA-256: d05215f01e5f88e0c487699698bfee564f2b8f9d646fcbbe72007815687f9896
font_02_sfnt_off00011c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1