Malicious PDF — malware analysis report

Static analysis result for SHA-256 1381cfdeec513f92…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 10:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 925cc7ef85d0f7782f682c4b5d9da371 SHA-1: e3800b6f74eb9467c8ff3423b120e335207a3f2a SHA-256: 1381cfdeec513f9230e22648da0db4d959ab93be1478e671ff9a074105e600eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into clicking malicious links. The presence of external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://archism.ru/uplcv?utm_term=amelie+piano+book+pdf PDF link annotation
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c734e0a22---95564339444.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d96625cf2f---83555913308.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/30179918893.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/93598522181.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838b3097707---buzobob.pdfIn PDF document text
    • https://svltv.in/userfiles/files/2598842173.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acf636929e7---29808738391.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c75bee4f0---2891222003.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/70068179993.pdfIn PDF document text
    • http://yulintimber.cn/d/files/72716245622.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4cfd437356de30abde40efb0d5501079/woxilovo.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ab86d3065---nirenegewonufevafo.pdfIn PDF document text
    • http://ymy-tea.tw/upload/files/zuvelatujil.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/n8ourc4temm2d6jhsb1j6j0cd6/gotodojariv.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da0390de465---wevikokatofezilapedab.pdfIn PDF document text
    • https://digicpictures.com/downloads/favavinorizaredajexu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e423c5b83---lajiwakefego.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/88018637640.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/tipimejudipemuvonu.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/69758475606.pdfIn PDF document text
    • https://argumentua.com/i/file/15104030741.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 10504 bytes
SHA-256: af12ac46c13f02421bdba40654b58616572d0560dd2aae8885673e75242250f0
font_02_sfnt_off0000fec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC4 19856 bytes
SHA-256: e91bde69902ebf8b5614e7bacd60b659114a97b46638a16720a5efa3b8a0b2a8
font_03_sfnt_off00013290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13290 1800 bytes
SHA-256: a9bee242d09f14a2a02d58616f167becb9d2a4e038e4e3db35bc4c72cb4bc1a0

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