Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df69658fc571150…

MALICIOUS

PDF

89.1 KB Created: 2021-06-13 03:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c1aedda6aea9bf6ba34d84beb4695acd SHA-1: c84d6578170c4d100d4d9b085c5ace56e28b755c SHA-256: 3df69658fc571150b88ede3bf1a4477259d93140a0e072c0149e0f9d98ec2b06
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised websites or link farms designed to host further malicious content, such as other PDFs. The presence of a 'download button' heuristic suggests a social engineering lure to trick users into downloading a payload. No scripts were extracted from this sample, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=pubg+1.3+esp+hack+apk PDF link annotation
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/4725f8807ebfbb48304a2a27515ef8ae/19871823415.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88c97bd0e5---16944446019.pdfIn PDF document text
    • http://altinay-law.com/images/file/96945882428.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/44255486258.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/mizirupamukazavatabur.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/watefokilogevizak.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/8b2e590bb24fa697798f22cc1c10ac2e/jaduwenimijominubujut.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b831a576---vokezolupikaselaxugagefu.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/2m36h3hg0n7itlhfucjkhtp5ja/16291819067.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/81154984265.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/motitodojes.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc14bd0ee---9975386935.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/96849096725.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6764714f5---vipovigevuj.pdfIn PDF document text
    • http://skupka54.ru/upload/m/dikosabemerepegun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off0000f726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF726 2888 bytes
SHA-256: ca808623f1fbb2a206e4d56ed0195b1f511a32093dd9dea33e71db9e4da69b13
font_02_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 5520 bytes
SHA-256: c255d01dd91b502cd9ad8ef2d166cc95054d6160b27404164dae989223120c45
font_03_sfnt_off0001144a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 13500 bytes
SHA-256: fb1c42757c07267695bbb8c4569a2dd4662858245c330b1745174c05502475b9
font_04_sfnt_off00014078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14078 16244 bytes
SHA-256: f396ce70ddda275cb2fa08ed7347985679fbeb9c15b95dc92ab9f1f1e8a9dfaf

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