Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aac0921fc468f1d…

MALICIOUS

PDF

78.5 KB Created: 2021-08-28 11:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f757666a3d515bdf577efc0ab591add2 SHA-1: 60f875a331b3b256e4e8f542eee44ae04e7affd6 SHA-256: 6aac0921fc468f1d5acc2b3363326a60d64ba08da32e955d8403e6e98c741c7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and heuristic findings suggest it's designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://szentimresiklos.hu/upload/file/85081018235.pdf In PDF document text
    • http://hnkingdee.cn/Files/file/202152422349.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b9390085e14864d07b09b8f95cd94030/75842965600.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093ddd9254b5---53352838474.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/fowuxegisi.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/pafofuzuzudix.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/34277699022.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/sojav.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/naxenaxonufipepenup.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/susonu.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090923a0d7d7---pinok.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/91f92ef45f6ef8840bb5fb175d53aeb8/pakujexu.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/votalajovujimuki.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/5182427903.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5fffb9615---7845705720.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d7933b2ba6---burufa.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/kudebawajusoxegukide.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/84022645364.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc745ddb33---wexene.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/meralegokis.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/41655440875.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/87f98597e5ebbac7fe1d1b631b906440/6059356387.pdfIn PDF document text
    • http://beateromer.com/bilder/file/vumajivitobevitogisetif.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/govuwajizawegonubovefuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=2020+charitable+tax+deductionsPDF 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_off0000cec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC9 10952 bytes
SHA-256: 9ef87c27615b3928f9b20cbbb125bb42c65ec76c389695d65b0b97b2e9510581
font_01_sfnt_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10040 16656 bytes
SHA-256: 0c904157e6a0a6b72b6e286f77676e9c5fabcc4bfe95e3af6b019b00243b639a

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