Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bc7a65f38a0e2b…

MALICIOUS

PDF

87.2 KB Created: 2021-07-22 04:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76a814aabeb2bfaf090893e617b9d1e0 SHA-1: 4b6381817641165c753d7fa73769b2c8f00a17e1 SHA-256: 98bc7a65f38a0e2b8390e94bdc1d79e4e98869366825554c31c38c00585be625
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The PDF itself does not contain executable scripts, but its structure and embedded links strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/sd6584c1mnc7t6oiajma0b1ljm/jabage.pdf In PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/78e5201da55d7b4a62e58e7446a4b7f5/botimisamanidisa.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/7067480938.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/pesudexewisowi.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848ad07d08a---958035523.pdfIn PDF document text
    • https://songuryazilim.com/calisma2/files/uploads/93773225610.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/g6inlndpnt6ap8962ufi87vcvi/tusufuradilanajaviladus.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/0268cfd7884a9795f3c734e6358bd60e/40091158360.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/07/15/boxarejadujuwatafad.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cfe589fc5---fobitejetenafufirukajuzo.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/87746523445.pdfIn PDF document text
    • http://stillwaterponies83.com/clients/74660/File/doradujorobusojupirera.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/62324066584.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/47894666970.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/674470148.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/72669266077.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/nopobixuwogafutapekidaf.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0ac9f46b---geletobadilape.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d2430674a---81726699737.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16076fe34972f7---90335939528.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e14d901b5a---bezip.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/2c1ece12dc94655507ca77f69a620711/womexemuwose.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/48295106973.pdfIn PDF document text
    • http://accronline.com/userfiles/file/betiwotunivafepesomi.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/kabiteguligiguvonivisajib.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/713adc2c8a41634be495ac107dadea58/89860661304.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/kutenazopifijaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=st+mikes+gynecologyPDF link annotation
    • 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_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 10592 bytes
SHA-256: 1f15f3d048147b35a6767752eb2d04e70049df281ed09a8b3c68c70f12181a9b
font_01_sfnt_off00010aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 17036 bytes
SHA-256: bd8ca7fc041d5f1d7c856c264cd26ef91a06018f4817cfa9705989def1c97f2a
font_02_sfnt_off0001378a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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