Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bedd06e79ebdee…

MALICIOUS

PDF

88.9 KB Created: 2021-06-27 23:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b1d0001af4f18afb8246c80576b4ca4 SHA-1: e4e08af4ce125986158883ed81c254be1eefde91 SHA-256: a4bedd06e79ebdee576a77e8277e684786ef8b6e786aef571a8406a53139bb3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. The PDF structure itself does not contain readable content, but the presence of external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=draw+the+structure+of+plant+and+animal+cell
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb772fe147f---25405588157.pdf
    • http://normel.org/files/upload/file/59718271121.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/55571b3de87ee6332a283b08f1ab4952/25202230990.pdf
    • http://niezapominajkowo.eu/userfiles/file/sukixore.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/90815ba368d2a58efdd687da14922521/21575183970.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072811798ae4---70446767591.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f2e1cb82ec894266fa4068bedaf6d4b8/toluwetila.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/bf50590fc7ce4085cefabae0fa299077/9811131619.pdf
    • https://travelstore.tn/userfiles/file/34923800232.pdf
    • https://airshow-bg.com/file/sidamoraki.pdf
    • http://rajhansnursery.com/userfiles/file/bezugir.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41c2fcdbc2---76253377313.pdf
    • http://diversecityuk.com/userfiles/file/panekimizebewe.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4df13076f---fifezozivokukajag.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ec9b695ac---93182137614.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/883e8d330f3113c0453cec3a3b18233d/perowaliba.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1609b425524bb9---tisapetarixaletexujon.pdf
    • http://donghocasiochinhhang.net/uploads/userfiles/file/mitura.pdf
    • http://matsonconstruction.net/userfiles/file/piwamikefanegufomajiv.pdf
    • https://zionapostolicministries.org/uploads/file/25365638099.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cef7727a1---dutimevubirewaz.pdf
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/4091228583.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_off0000f548.bin
12782d5e0ec888b29a858c2956e706c762db3e1941b8ae2f75c0129e1c4ddaf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 11072 bytes
font_01_sfnt_off00010eeb.bin
e1cbe17cc99d01c7cbd6d35cf42c9fedfbf4e939e8e3f19211ed7b7e0363870e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEB 17544 bytes
font_02_sfnt_off00013ca0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA0 16792 bytes

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