Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ede44345e89a5c3…

MALICIOUS

PDF

84.2 KB Created: 2021-07-15 16:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 474312cd234457df368ab2050a4eed24 SHA-1: 1442240640030834b2249012e8eea71ca9b875b8 SHA-256: 5ede44345e89a5c3259d7408a88d62bc75b1503bce6246aa6cbd59dc9cedbe36
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://simonide.org/userfiles/file/74970288625.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b4608b274---naxuwagaj.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0268f333f---peguzi.pdf
    • http://hanboo.cn/Uploads/file/2021071306493770554.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ce9acfbaf---monezizegasijarep.pdf
    • http://toshiteriyakiburien.com/uploads/files/21966552713.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/d7d6b721a930b21099d9cd2b4c5d91eb/15473452534.pdf
    • http://makingthegradetexas.com/clients/d/d4/d4716c73f098ea79da165a2194b6736a/File/dewolononen.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210507061611.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d59f17ef13ca009d02dbbef71b4c5d58/fezira.pdf
    • http://fogathajtohirek.hu/fckfiles/file/jibama.pdf
    • http://sl-light.ru/design/img/upload/file/wijivifid.pdf
    • http://goksirlambinowice.pl/img/upload/files/88298097000.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/94819cdf2e144b68e1f55c470cd93bbb/83026357139.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85dfce9cf2---71154036961.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f86d333223---wadasukobaseg.pdf
    • http://taxilitomerice.cz/ckfinder/userfiles/files/83153900961.pdf
    • https://carcable-bg.com/uploads/pictures/files/goleb.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/7bffffdfecb3f9a6359fb2ddad69a945/61170558978.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3aedf2a539050f50f7ee1daeec8d5c26/verokopafetixibuz.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/820016fc71834518c0f0f89007c2e8ae/54287291197.pdf
    • http://ronaldtan.nl/images/photo/rumutunalonatasidipajitif.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=time+value+of+notes+and+rests
    • 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_off0000e656.bin
a5036444bd6bd280a4845b18eb98580cccbef85327f1c37f11d77500e096829e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 10644 bytes
font_01_sfnt_off0000feb0.bin
b37a15b2272ca34824876fae7aa0c55d3fa14ff0df1b811c3bcf59ad0e7a1259
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 17196 bytes
font_02_sfnt_off00012b94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B94 16792 bytes