Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4f223b06108280…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 12:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c0cda1b0865bb1ca99be1d20258eb03f SHA-1: 5495348dba43a3866b5b00b72ec658e8ab93b11f SHA-256: aa4f223b0610828052c9be616b488c3ad2373d002494618be9beb9c7767f469f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the structure of the document suggest it is designed to facilitate the download of further malicious content, likely through a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=el+cisne+negro+libro+descargar+pdf PDF link annotation
    • http://hooleihomes.com/cms_images/file/jogipaxupuxifisus.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/rilodajev.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/pelilevirituwoxazot.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/46088554225.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210816025042.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/nq57nr9jitqjdv5hoeikl75g3s/gemugodugudujotali.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/zumenozi.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/cv84qn9cne685rvdgh8l1tdk58/41989811293.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/nunulanag.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/83855006362.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e011980ab8---tuzekujuranulamerevuf.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/15285581206.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/cafec38eed1a7fa753a9c84a1754b467/10593437062.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/lptgpnnmnun16m0dt2lahj92jo/kepelibu.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/h4cahge0ckhdvg4gd5m92ogoo7/zuvagemogejilorufepajekor.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/53625680100.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/73482760886.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/88827806446.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/729e40ccded5df862080b0a84ce2849e/vojaxibivujogaberixet.pdfIn PDF document text
    • http://salwex.hu/file/dununiwudidurivuxepalo.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611da2b7a2aac---18451861536.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c52cf650e65---87447675854.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD721 10820 bytes
SHA-256: 6d1705ec1bf042b9332e5e19c535dc44752985f29439e306e902437ffe1d6167
font_01_sfnt_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 20156 bytes
SHA-256: 82e32c01922b928f6f5274d65bdf11a97b985029db7984163e6f3a71cf6b9b11

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