Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed578d551f8ac016…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 13:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2850f8ec9d499894f939a781391b5ff7 SHA-1: 00f55ca9e40283586944bf2f781fc68ab977e049 SHA-256: ed578d551f8ac016aa26099a2d41bcaded9bf3ee3d7fa89f4b62e7c2b7a50013
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal numerous external links, many pointing to compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure point towards a spearphishing attachment, likely designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=farming+simulator+16+hack+free+download PDF link annotation
    • http://garantc.ru/userfiles/file/golezivufa.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/vimokinamigupomevuxupat.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/namikunilojaradidefigabot.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/69711717259.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/1583698385.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/tixajupigokugudefubodipof.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/sufisivevesujolezemojux.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/37310570781.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/8346307892.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/nfaadvmduf4jbe0b6vltat6546/49032179432.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/96431991319.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/2fe68b280c2aee958a86d62871322bb1/93564516393.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/62640439389.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/85445648151.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/8423faccac3f135bc1cfb449c0303d20/44048467863.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/53027891908.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/75684838561.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/bebavegavotuto.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/54876137120.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/disowavogegu.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/logakamafasapomuduwu.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/bj6c1ekghiq7m5mlbraum22n0c/benukigadukowetot.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/tirozagutegiwaxepifisema.pdfIn PDF document text
    • http://ahknchem.com/upload/files/36329173248.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC919 11396 bytes
SHA-256: 633ae1506329bebab9d7dd3d5436fc55d1b2e5bd53ad1950cccc049194a23765
font_02_sfnt_off0000e3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 15816 bytes
SHA-256: 18b09398475c757355ce730d67b287bc99a5b58fe22c967d59b7c6aa18dd5478

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