Malicious PDF — malware analysis report

Static analysis result for SHA-256 a660b1084a822335…

MALICIOUS

PDF

71.2 KB Created: 2021-10-02 09:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aacb7cf37c4376936fb3ea4565ba7cb1 SHA-1: 9878e17b261fc51c7f2def3e469968692be12293 SHA-256: a660b1084a8223358466ad903ac15e0c0735d59b4a647dac95c08c108e532561
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations and disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=betterment+of+the+company
    • http://www.hermosabeachbungalows.com/userfiles/files/lereranebozurevijizi.pdf
    • http://www.galiantsolutions.com/emailimages/file/wexurarelesavafabixedu.pdf
    • https://abyway.lv/images/ck_images/files/balewewaku.pdf
    • http://ore-processing.ru/d/files/80675633723.pdf
    • https://isabellepieman.com/userfiles/file/zajitidomajumotubus.pdf
    • http://elvirajogsi.hu/ckfinder/userfiles/files/pojab.pdf
    • http://beautybybelief.com/admin/images/file/zelor.pdf
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/76625691822.pdf
    • https://knurussian.kr/DATA/upload/files/202109291026109748.pdf
    • https://b2cexpressdemo.com/userfiles/file/sudolinejofalesupajawino.pdf
    • http://aliguoriarchitetto.eu/userfiles/files/pugininetezilobozigufosuj.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161500b309c24a---40437968695.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-9-21/20210921025249725863.pdf
    • https://beauti-full.ru/uploads/files/56765645739.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/pr6p7op0omduddhbgfbkuc4gjb/81850143480.pdf
    • https://slotpt2.com/contents/files/sakenerasinurazinewumed.pdf
    • http://wxmx.cn/upload/ckimg/files/202109261950479335.pdf
    • https://aspirans.com/files/file/70560259200.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe8008a00---veramukojixulonujoxatofa.pdf
    • http://www.kotolantopeni.cz/files/83495550640.pdf
    • http://asremajazi.com/uploads/files/bagudakekikunegobu.pdf
    • http://blackivy.pl/userfiles/file/21840861942.pdf
    • http://atol-res.pl/uploads/file/64037040127.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_off0000b2f6.bin
623ff07282743858da5a693debfbb41b6563106aabd527e7a54652b9424ab0b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F6 17528 bytes
font_01_sfnt_off0000def8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF8 16792 bytes
font_02_sfnt_off0000f70f.bin
7fd28ab2ab3e6d91ef9e47cb66d55b956271e5b7e6ab65e552ec8a0158e0f87f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 10604 bytes

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