Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cee90616291234…

MALICIOUS

PDF

91.5 KB Created: 2021-07-02 21:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c1c6f37ca6034e6f6d9474f625182021 SHA-1: b7f14dbb7e573e913d19e16182e34297b1ae92aa SHA-256: 78cee9061629123451c438c561394c5b44d9663497f33b3ac6862876c730d8b9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users. The presence of external URIs and a link farm indicates an attempt to lead the user to a malicious destination, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://europartner2.pl/uploads/75842104954.pdf In PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a89d2d806a5---tezejusogosojepibozojusi.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/j0dls059ucld4sceth690tadnm/metuzunuluwagarodigu.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/f539c1101b6d91436c76006b4796ced5/45062149785.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/88103764952.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b89b565d55---zumatofiludimozovunimere.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/zadisi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1fb05d064---mudoxoxuranivubuf.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/jexewurevodexalupeb.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/sulemopijoleta.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/dea2dab303bff9e20bfbcdd89c34efe4/44519918061.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/53377674453.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/88c6e17de25c72e31b40e9f02451b86a/derekukezurofubefes.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16090e60a48595---nidigufilovavexugivete.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdce99449ae---88255228393.pdfIn PDF document text
    • http://apple888.vn/luutru/files/juparevegoj.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160da39e185eef---12545392537.pdfIn PDF document text
    • https://slide-bearing.com/d/files/zubifufipabedololen.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/99069817c82d4d5ac4e9e4cd79d91f03/92668228672.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/walitepizinotefeguzetok.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/64814799772.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/73062196732.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/tivibapafarirapixer.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/es9cr72it6tq301ngjn6lc95t7/bifalif.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/df9fsmi6ofb3n7j0lp7m973530/tixenijiba.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08fa449347---zeras.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3s7i5ivm26991q8n6fp9919do6/bowunonedosexure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=8+weeks+after+circumcisionPDF 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_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 10840 bytes
SHA-256: 5c43773df54396ca8cc066867336c7369611b93304ec51cc79432bc62f3e217a
font_01_sfnt_off00011c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13441 17116 bytes
SHA-256: 719f866c0096eaf3f25b1f96394a022c151b55181c73459adcf799fb9d149761