Malicious PDF — malware analysis report

Static analysis result for SHA-256 abe633b80b1429fb…

MALICIOUS

PDF

74.7 KB Created: 2021-09-06 01:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb4ab722b74bef700b746361236af6a1 SHA-1: 0752a0273d6879851cf53821db585a14bc1719bd SHA-256: abe633b80b1429fb033ef46244501d607560987d5ccfc5cb33280874d2d266e8
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/uplcv?utm_term=ap+human+geography+religion+test+pdf PDF link annotation
    • http://hutergroup.de/userfiles/file/wubalibifo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fad117b58---88440453782.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba8996c70---82597077711.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/96115587816.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/42561004140.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa0730b9d3---reralaxekuxesoras.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/govegidovimo.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/tosejanematupilemukemusem.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/79804852195.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/disamoditazigu.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/23608386928.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/64749814546.pdfIn PDF document text
    • http://24cvety.ru/upload/files/tidetejuzaxagim.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/vupidulebanozun.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/8061496269.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/94412660574.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/45331053293.pdfIn PDF document text
    • http://aweibel.com/Photo/file/2913878360.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ohec0bp6ulq6uq8cn38ge2n51/76459302492.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/58636223129.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_off0000c15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15A 11140 bytes
SHA-256: 7e79e0bc50b95d553e5bd05b2ba2da42e3225a262a3e408aa8a01159a443a9fb
font_01_sfnt_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 16616 bytes
SHA-256: 270ad8e03b64b8443b88244cae94313bb7c697264e1a629b4c7633c93bbe8b07
font_02_sfnt_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1