Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cc747f3c6f3c57…

MALICIOUS

PDF

84.6 KB Created: 2021-07-06 12:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7899a1f73a9f9b98ae9516194475046b SHA-1: 09314a0fcf65101cb125aa69522833e020ed4e8d SHA-256: 15cc747f3c6f3c57a76c97856946b80aa0c65d38e389a64dee9324f4aca89ad1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The primary purpose appears to be directing users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://coffee33.ru/archive/file/nitibojisabesema.pdf
    • https://amitadevnani.com/userfiles/file/49484485696.pdf
    • http://asupuro.com/user_data/image//file/wuxifovodugujow.pdf
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/lotadoxegumixubiragamupov.pdf
    • https://steammining.com/userfiles/file/mikewixefuloxavekod.pdf
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/wewezekoboto.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080af353d25e---pitewimuzujajugi.pdf
    • http://nghiencuuykhoa.com/uploads/userfiles/file/bazenogixoma.pdf
    • https://proektasis.gr/admin/spaw2/uploads/files/dexedef.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/fcc16a2d3cdc84a914e184218588b00b/jomon.pdf
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/249ebecab0b2ff0f1c61730010f33692/xeluvevewesa.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16078673a94332---94577202052.pdf
    • http://ibtaker.ps/userfiles/file/77241939350.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8d528942a---nonisewovuf.pdf
    • http://redigonda.it/userfiles/files/84888876536.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/4084703579.pdf
    • http://aivieksteslaivas.lv/userfiles/file/69493573081.pdf
    • http://viticoltura-enologia.com/file/87012020580.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d895a45a---vasuf.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/123dd28b695728f5ed0c2d1ef648f54c/filaranape.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b6bf01e3---27198803840.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f488e686d2---pejivoxalakufezov.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082986c5bef2---81030673272.pdf
    • http://xlsferrosilicon.com/d/files/19137393004.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=into+the+woods+jr+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95f.bin
741e86a1d72900070d2f25243f848555d007ec362554066b5952336d5b762d07
pdf-font-stream PDF embedded font (sfnt) at offset 0xE95F 17032 bytes
font_01_sfnt_off000115ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 16792 bytes
font_02_sfnt_off00012dc4.bin
d8fbbf94b81b069f6026dd391c1001eb23577331fefbb4e379e655fe9c4bfdfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC4 10460 bytes