Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98132477122b3c1…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 23:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f000422a4c0f1fb211cf6b549e35fce8 SHA-1: f9b750b8907a4c80ce052cdb6d7d3eecf4cc9dfa SHA-256: f98132477122b3c15c9ce1bcddae33f8b298e199c8a3eb3641b009b531a65719
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URLs pointing to other PDF files hosted on various domains, some of which are flagged as potentially compromised or disposable. The presence of a 'download button' heuristic suggests a lure to entice users to click these links. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a potential phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5815

Heuristics 7

  • 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.
  • 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 http://smalternatywa.pl/media/upload/files/fe468cbb638b68191204182f25529b91.pdf In PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/10633369648.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/65747038589.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/47464739456.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/1k25mco9m8j7pmi8lcl3s5gjm0/73861969605.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/fejorolabokaxixozomidesum.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/zumajab.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/tasogipuvepezuv.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/bobiwipuza.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/gutezudunusapodefud.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/nasadotiwepiwenoriti.pdfIn PDF document text
    • http://apart1day.ru/file/43133473339.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/bowamu.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/99366278433.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-4/20210904205858814474.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b702e12eff---kesuzuwisekog.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/87871812201.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd4a2307d2---subovimabuk.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/tokaj.pdfIn PDF document text
    • https://sapporopools.com/contents/files/6399048052.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/97448064558.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/04p8fhfifubjnhhl34jn84n700/60211661906.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109010902006767.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/wiwar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=farm+hero+saga+mod+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 10568 bytes
SHA-256: 2efa127585ee43b1b3b3edd06e8c2daaf7dec0bab6745e6a6541a4d70d933a3c
font_02_sfnt_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 16576 bytes
SHA-256: b40aea712794d40d0d2f19039f4ecddc90b3db24aa7b280d8bff809a5e9d33c2

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