Malicious PDF — malware analysis report

Static analysis result for SHA-256 08cc2f55f8d03df1…

MALICIOUS

PDF

116.1 KB Created: 2021-08-08 05:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ba40f1ca3582e62733402e1de5a340d SHA-1: f57c53115b8bc8dfa587d2e2950cd44b6c0c5bde SHA-256: 08cc2f55f8d03df1014d76aaaee1ed9f71823bf0e60679b49d804a6bc81cc866
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to various domains, many of which appear to be part of a link farm hosted on potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to phishing or malware distribution sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine rankings or track user engagement with these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://romanakladatelstvi.cz/userfiles/file/zudisibukuzeroxevufanagam.pdf In PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/wopidiralewo.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/2bd68fe390e34f74af056acb32689723/satifo.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16109fca37e0f1---52103633988.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/sopuxefuredisemapamap.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/mfqm4cqfiqepoc7khmehk2hh64/vevifonifif.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/agc731fhurn3c8erdlgrhsfog5/9025755141.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/kudiwupusikigelabejosa.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/852jfb9jakf45d1vuvtrpc00t2/kogilabubatuvas.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/dububiferasidebus.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/67901340384.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ausbm2ivt8nus8g2nna0p3bnt1/81365430728.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fstlq350bn87h92mob8rdmdih5/dufunolukikituwexufu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103757fa34b4---pusofebowe.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607835e1e5f7b---kelimuzenitalados.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/97252052212.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b3193eff---mosumawin.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf625bbb205---tepaxijajanefewuxamab.pdfIn PDF document text
    • http://honghuibio.com/d/files/86749804724.pdfIn PDF document text
    • http://usmleworkout.com/files/file/vibisudoginiwavu.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/fbfd4993c8d6f35795f279be479a8618/67542333700.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/2257449243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+wear+the+cub+scout+neckerchiefPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/24751524504.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_off00015ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA5 10796 bytes
SHA-256: 0499f72dc425ca3949fd028122febc08b1b5b457f491019fd3302b6feae5be38
font_01_sfnt_off00017483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17483 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C95 19996 bytes
SHA-256: 811b780bb3bb2e2fc3846c86382926979246f63306e7a975e54e4ef7b94e7d06

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