Malicious PDF — malware analysis report

Static analysis result for SHA-256 71210b158ae2b4a5…

MALICIOUS

PDF

107.5 KB Created: 2021-07-31 08:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc619cc069a9a085e9d26c17354fddaf SHA-1: 0ad0d009ced209fd81589b07ddd32e9de3f467c2 SHA-256: 71210b158ae2b4a53b3d745f749566bd6d9b6c194ac410372b7a99cb07bcb0e9
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links implies the PDF is designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://exmar.it/foto_fck/file/60015861591.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf94b9a209---92279946891.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/r4ndk78chn4v7hlf8m2nk9bnpa/xapopalafuvawapumes.pdf
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/77464689539.pdf
    • http://raffaelecavazzoni.com/userfiles/files/ginoxaraxiwenatajezod.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/bjufllt7ivav43adkvlq7ichs1/veforizerari.pdf
    • http://saxonrt.hu/img/userfiles/files/79797141295.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a397098d2e5---lupisejazagupejedazofe.pdf
    • http://modamoda.nl/uploads/pic_lib/file/kixuveti.pdf
    • http://140.121.125.49/ckfinder/userfiles/files/20210723_091623.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a91e80d3bbe57103a2c09e30c20b9caa/57577236349.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb11c44c64---2133069732.pdf
    • http://cmtsport.com/pliki/99769820923.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501050536986496.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/6144381fc46b6b12d9447640a1d47121/nixojaxagogokifif.pdf
    • http://morard-mcf.fr/data/Files/64565554278.pdf
    • https://nsck-cykelmotion.dk/userfiles/file/zerevokafoduk.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/1ff5814429285a6b551f7830001d0137/32430733475.pdf
    • http://ruoumoc.com/upload/files/fuzejuseziwikipavepar.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc81a010c3---17051043518.pdf
    • https://rcvizovice.cz/ckfinder/userfiles/files/72400750405.pdf
    • http://vina2002.com/uploads/files/bugobemusirofegivodit.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/90475388aa389ddebff0027b950f3625/39929084236.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf1edf5a4---2271181421.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+overall+message+of+a+christmas+carol
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012139.bin
4893340426a151fbd96f3aaf84c6c8600ff252383713f1e0588df6145018b7f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12139 9192 bytes
font_01_sfnt_off00014065.bin
0bf642593ce78312b46ea80916691e0a56ff8f6d99aff4cebd8cc74b017b1216
pdf-font-stream PDF embedded font (sfnt) at offset 0x14065 10736 bytes
font_02_sfnt_off00015925.bin
545a433e8677bd23ee69e6265a0267306479cf82a3d63350c9b9220cf690a5bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x15925 17972 bytes
font_03_sfnt_off00018797.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18797 16792 bytes