Malicious PDF — malware analysis report

Static analysis result for SHA-256 a886b080c8d2e92e…

MALICIOUS

PDF

102.8 KB Created: 2021-06-27 04:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61aedf4abc3c5d0047630fa66e2af67e SHA-1: f935c715cc9b76d5e5a9caa82f92f646878caaab SHA-256: a886b080c8d2e92eaeb23af88dd52e1fdffde7ba9e2b27ce66cba737daace80f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting domains, likely for phishing or malware distribution. The presence of external URIs and link farm characteristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://bjhtdszdh.com/v15/Upload/file/2021514167538598.pdf
    • http://parvazyab.net/basefile/api203/files/80488085114.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/5a8nmj8nvcfa0g41e8kusn1bue/63543782274.pdf
    • http://westernmaki.com/uploads/files/68246352797.pdf
    • http://3suntech.com/UploadFile/file/20210627073349305.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/vapaminudexotasobusit.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779f44e93d4---bovikobawuvapol.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a944085399796ebf9707083d70e623bd/wevejevaleb.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/kb5dacs46j06ugef18rp2lgg94/87992629326.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/zinejejajoruzofixobexog.pdf
    • http://www.chatanakonci.cz/userfiles/file/bitefoz.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2661677b5d---44640859272.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/22f399346651ef901cf8d17277654125/85474082302.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080c5926bbba---gafelulaziputodu.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e624a56d7079417fe7e3b4bac728f526/wekagelilal.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63fc48ad12---50895397001.pdf
    • http://thedewakohchang.com/image/upload/File/edelovilokuboxaverusaso.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827201e7099---98744342709.pdf
    • http://ever-pioneer.com/upload/files/ditedotirolepotiw.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a47f8448285---gemesibosizusakiju.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i67qq213j83jm4ojio1h40dpv3/vujeb.pdf
    • https://kopari.hu/files/file/napopurinifavipu.pdf
    • https://bosgo.mn/uploads/files/natur.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0sb6iastjhthk2q20rsk91qj4r/70318684373.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23f2b195a---refupivujovimobopo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=past+simple+listening+comprehension
    • 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_off00012d25.bin
3f9a258bc9f7658fc0560cbc3eb52d1af3f12925c8636efd7e01396c110cefd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D25 17988 bytes
font_01_sfnt_off00015b5b.bin
e833f8981be3db2fa37b1ea0a6e97bcbe0c5ac60195f5cb2eebdac836f1af66f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5B 10820 bytes
font_02_sfnt_off00017415.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17415 16792 bytes

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