Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff41c731563b1743…

MALICIOUS

PDF

83.0 KB Created: 2021-09-14 11:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf9001a2d9b3358660ce696afc4d2455 SHA-1: c880fbd203e4a3430a3bdf2332e74df27ea4f901 SHA-256: ff41c731563b1743f50169dc9b1e947a010e8b537580c082e4a075559acf39f4
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates the document instructs the user to press Win+R or paste a command, a common social engineering tactic to bypass macro restrictions. Several URLs were extracted, some pointing to compromised CMS uploads, suggesting a distribution mechanism for malicious content. No scripts were extracted from this sample, but the overall behavior points to a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/16651460982.pdf In PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/74942542481.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613455a8abb32---94791972514.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/74295750874.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138664c529e3---43404622886.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613de7f608a0d---29906230461.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/39065288010.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/zikusotosinumo.pdfIn PDF document text
    • http://alvitraders.com/files/wukujotegulezub.pdfIn PDF document text
    • https://andrejc.si/files/file/netuvudusaxuluv.pdfIn PDF document text
    • http://fnathservices.com/upload/file/10446857038.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/nigewuto.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/85417729386.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/fonofuzeterid.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/pixojazegifelumozidub.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/11631139527.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/jakoxa.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/pusopoxamefenu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f302e08095---polutavefibetir.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/84226396725.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090905321721.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/73780515654.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/medopidarokokipakugopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+screenshot+on+this+devicePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 10400 bytes
SHA-256: 12cd3ee970af12db0368380fc986435ee9dcb0f66bee970d006735476e282bb8
font_01_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 18444 bytes
SHA-256: 38dba7136d3871489825b1f9aef10929baf7d10c38857baf68dd026edebf90df
font_02_sfnt_off0001267a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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