Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58eb882fdfdad64…

MALICIOUS

PDF

147.4 KB Created: 2021-08-08 02:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1aa2c102f8b03ba74d2e75e9f5b531d4 SHA-1: 3952298cd528a1552dc7c9323918f7fb8259745c SHA-256: c58eb882fdfdad64d0673156d8834059ffedb9d7f172645bf216e7d925a8e42b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous URLs, many pointing to compromised CMS upload directories, suggests an attempt to host malicious content or redirect users. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to call a phone number for a fraudulent purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/gttl06tbgj9pv83m410p0enain/47825010197.pdf In PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/zoxujovoxegibowolinizexuj.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/f58fa5f058fd5697b55be216efc8d6d5/wurozonifawegumoduma.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/91409272299.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/xubelap.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/333ad2e95a75f16baac7221b1a735fad/94519912563.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/54032958754.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/74585916444.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/rowudif.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/10314509959.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb252c2f925---rubokekupurexepe.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d44309d08---muwunejasogasixolugimor.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b7ba97523---gisurevimoxefokuboseje.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/40735294315.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b1b7f31e8---44279145055.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d821ae5fcccdc84cbbf03261b6b9d075/83383738052.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/444e896d55ec81e28d5dabaa976238a1/seginuwan.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de876cb5fb---baxosaroribe.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/92927f1fad38710e3e7ba5e5560848e1/52548522864.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af4f3c0f0b---kupazadigalabujalikifofud.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/24304521076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=que+diferencia+hay+entre+socialismo+y+comunismoPDF 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_off0001db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F316 19488 bytes
SHA-256: b2ac72a28411c06851c59ad9623c1ede854551e9ee587eaa5034150140f6237f
font_02_sfnt_off0002259e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2259E 11012 bytes
SHA-256: 258aa8dd7c06a09baf7ec20e312b557fb6ef8e67d1c776b6d56478167b0d5e66

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