Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fb04e2e0024764…

MALICIOUS

PDF

85.7 KB Created: 2021-07-01 01:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3047b44601f16d5099658c15e813867 SHA-1: d5ed15fed141aaf05f5498f718a50bf4695aac5d SHA-256: a7fb04e2e0024764216c597060703511f127155412b69ce90df542c7cf173730
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm hosted on compromised WordPress upload storage, with many distinct hosts and UTM parameters suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of numerous unknown URLs points to the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a4cf8aa74---ziwudabim.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf31eb0ecc---45412462524.pdf
    • http://sarljarry.fr/userfiles/file/ridudawanefoni.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f816d52c983bafdf3f33052cb04c47ce/wodisiledigav.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9176c7878---37682289789.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/heq61qn23n25u4o7asfipkg0om/3706023603.pdf
    • http://rfychina.com/upfiles/files/16250888532838.pdf
    • http://hyundaihungthinh.com/uploads/images/files/sigimasena.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/kisj8e4tfelv1979jsamkgrtt2/44544081707.pdf
    • http://bucketdiaries.com/uploads/files/60493179575.pdf
    • http://kientrucnhacuagio.com/upload/files/bowatatowopidiwogalorus.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/cd7lbdu0vmhu4bbl7qtgv21hhu/87101076843.pdf
    • http://hutergroup.de/userfiles/file/48985111042.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f956753557e3e4dde26aee80647de442/zisoxa.pdf
    • http://capitaloffice.pl/fotki/file/kujuwedekujox.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc1f04ea30---goxotutez.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/23d48ab1491ea8d090144bf00636fd6b/40138690395.pdf
    • http://fmi.lu/userfiles/files/menaworalonuwiki.pdf
    • https://amblamy.ee/upload/file/fazeb.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/0c4a8830f73b48092feb091a12820a8b/ninerabazupibuvamug.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/51c51b651fcf95457bee261f826293c6/lixaleserofegodi.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac5c16ddd---16572851880.pdf
    • http://hyderabadibiryanicorner.com/admin/images/file/vuxevotexeforiraju.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39316c007d---5844174484.pdf
    • http://aire-limpio.com/img/editor/file/42535774449.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+does+it+mean+when+you+hear+something+in+your+ear
    • 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_off0000ea7a.bin
e9c1ec87872e516c8398ef68ed879f30c05d01c115bad32806e2a764b25f88ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 17104 bytes
font_01_sfnt_off0001161d.bin
ced5951da81b838c5c2ddd24398433cfa608a47a868467fb17eb7d588c470ac6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1161D 10944 bytes
font_02_sfnt_off00012f2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2B 16792 bytes