Malicious PDF — malware analysis report

Static analysis result for SHA-256 18823efb076e7065…

MALICIOUS

PDF

130.8 KB Created: 2021-07-03 10:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f67b1e61c2e3f6f6ca05bfd4f92c9c9d SHA-1: bc773f1418aa18ea7034ba1a1eef00e8c538fe61 SHA-256: 18823efb076e706597f287c3ee0033d83c2727e9c3a6d268fbf99dd2299e016f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The presence of external URIs and a link farm suggests a phishing or spam campaign, likely using the PDF as an initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://dermalab.pl/userfiles/file/74746582170.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/5d8c707e60843529a15afb71a3389463/98378395703.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607301ddbdd52---lurokulakadif.pdf
    • http://ingenermarket.ru/userfiles/92319277854.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c490f55d81f---menuwib.pdf
    • http://mopron.ru/upload/files/22029525221.pdf
    • http://abwlargo.com/uploads/files/gasido.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/3164gtrit63pkm96kuv0l82ia0/27941394962.pdf
    • http://adabaskimerkezi.com/upload/file/75107001077.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec81c22d1.pdf
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/88867959768.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/bc620c5f0247aee7ecadce1f07368fe6/37713737915.pdf
    • http://pcserviszlin.cz/ckfinder/userfiles/files/22415302893.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608971d6aca5f---89158598346.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb557e59a98---rafobinizonege.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a66d44dbd---88805595487.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985d5edcdb2---76050599181.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/57938541232.pdf
    • http://basaritarim.net/admin/editor_resim/file/47170997334.pdf
    • http://manavpublicschool.org/manav/userfiles/file/95810451114.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f4a380403---fegepuxosizofowafak.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0ceb5707cdf9031ad0119f759d1d5195/belolevekudu.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc86acebd7---fogeg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=integral+calculus+problems+with+solutions
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b87e452d15a8419c4baad59845b6741a/43253210968.pdf
    • 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_off00019a0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19A0E 16792 bytes
font_01_sfnt_off0001b225.bin
fda006653552d31e926a19378fbdf9d65157de950bea230e89e02e3711153587
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B225 11100 bytes
font_02_sfnt_off0001cba7.bin
d1fd99d2d018136578eea2f273cfc2b1451f03ea019ca3e01a5b265534f924a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBA7 18684 bytes