Malicious PDF — malware analysis report

Static analysis result for SHA-256 884e11acda3ad0ee…

MALICIOUS

PDF

69.8 KB Created: 2021-09-14 11:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 811bf0c79d4be7b5e92a07d8cf601d11 SHA-1: 32d2099cc37bc00e5d235f06f4efe5a54e2a0f93 SHA-256: 884e11acda3ad0eeaf896b695629fafeb1909bc717ec6f1e40578b47e7c18487
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6326cf6a---42561368173.pdf
    • http://realcomfort.ru/content/upload/file/83014084704.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/6b615bbc0e32d2c59cf3a8a0809a2d9c/wadewebirexugefewaga.pdf
    • https://rumputhijau.com/contents/files/tevoda.pdf
    • http://frutapac.com/ckfinder/userfiles/files/34516208283.pdf
    • http://clubselectionvoyages.com/images/file/69707047166.pdf
    • https://strategie-forex.com/ckfinder/userfiles/files/midesijo.pdf
    • http://rsentco.com/upload/file/mifidazanedotura.pdf
    • https://landatur.com/files/galeria/files/zokiludenure.pdf
    • http://suaups.net/userfiles/file/43502475272.pdf
    • http://archissimo.eu/userfiles/files/27220783633.pdf
    • http://saddabro.com/userfiles/file/takir.pdf
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/30713245595.pdf
    • http://women-for-marriage.com/ckfinder/userfiles/files/14596674039.pdf
    • http://balcimimarlik.com/resimler/files/93531662247.pdf
    • http://blueyee.com/upload/file/120216002476.pdf
    • http://simsvizag.com/contentimages/file/57849678849.pdf
    • http://peaceinsrilanka.lk/userfiles/file/rafukejivabavi.pdf
    • http://fixafilm.se/userfiles/file/164695305.pdf
    • https://traveletrust.com/basefile/traveletrustcom/files/35171805435.pdf
    • http://tpdw.pl/userfiles/file/40847219249.pdf
    • http://nanumed.ro/uploads/files/diwewixexese.pdf
    • https://oriontradecom.com/ckfinder/userfiles/files/66461761781.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613c222ec3880---197144570.pdf
    • http://bygreenpure.com/userfiles/file/52671489445.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=download+anything+free+among+us
    • 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_off0000b35a.bin
7b779db6c0d2f05095c624583dbfcfbcc2b27fab614003fbcda78eb944ac7333
pdf-font-stream PDF embedded font (sfnt) at offset 0xB35A 14964 bytes
font_01_sfnt_off0000d89e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 16792 bytes
font_02_sfnt_off0000f0b5.bin
56f7dda2dc388f2c884885ee77ff081d2b9035259a412a43e8a8eebb2eae38a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 11104 bytes