Malicious PDF — malware analysis report

Static analysis result for SHA-256 a121ed3647f730bb…

MALICIOUS

PDF

94.2 KB Created: 2021-06-27 00:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1561528fccf2b85904d461d6234f616 SHA-1: 14dae3c7003e30c3e1420a997736b8d2af43a46a SHA-256: a121ed3647f730bbd45d17934130f95a084bc6b08744e41999ab3cf332765f32
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further payloads. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://macautemple.com/userfiles/file/wokididitaxezibufelafugo.pdf
    • http://intergeored.com/upload/File/mogezanepoworufixebuk.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31f759d75a---vupolipiledodon.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc71bda3c2---pimimarepukafelisovi.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/4296aec417ca250dce15abaccf526d77/tofelujeb.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f9880272c3a4283aa2e2e74ed6c92ce8/18497186240.pdf
    • https://magatek.com/documents/file/12863140237.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1cc5dd873---fapuvafizatizoret.pdf
    • http://asbufestival.com/uploads/FCK_files/file/xorib.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/taverolamivaboga.pdf
    • http://manavpublicschool.org/manav/userfiles/file/37895324641.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160708c8b5e42b---fepekifulubilejulujezoje.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38a0705e0c---50006870243.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a354cc2gtqp8njhehpkaitdnq/74165668988.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/30504076945.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abd4f82393a---fonipufobonerelununiwaxi.pdf
    • https://abeess.com/userfiles/file/monezegabikirawidibex.pdf
    • http://ksnjl.com/userfiles/files/texokowefotaz.pdf
    • http://almar-bus.pl/userfiles/file/mezidudujejasani.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/98835972466.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/cce08e91bc489a4c58457c58dc976800/83031951064.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/67294da78a2965fd11ca419ef1bc9267/57851653153.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a5704510---14354604829.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/g22nn22fsfsgm062ue0npjj884/mixozalazokitiked.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/nuwaf.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04c7f9c17f---86765849258.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=world+cup+trivia+questions+and+answers
    • 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_off00010845.bin
d2569ba2befa5d95a8c75085688869aa8139381670dee1d27c35615056f46cc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 18836 bytes
font_01_sfnt_off00013a04.bin
255a407e25bc95b75e51a71e20c5efa5f6b64c46a5d1042e48ba75693bed616f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A04 10896 bytes
font_02_sfnt_off00015335.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15335 16792 bytes