Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b0e8c03cd03f9e…

MALICIOUS

PDF

83.6 KB Created: 2021-08-15 20:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2c8da7d646e80645df6de90461f7e4c SHA-1: 0b6b0d1a1dd18ba065b3d56b25d40c79c9462051 SHA-256: c0b0e8c03cd03f9e0064918aee5a510fc8379ef59d2cac2d51f625e48d8b9e15
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, directing users to numerous compromised websites and potentially malicious PDF files, as evidenced by the numerous unknown and compromised CMS upload links. No scripts were extracted from this sample, but the overall structure and URL targets suggest an intent to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://ck-kutnahora.cz/gais/image/file/mepetogu.pdf
    • http://farmaciafasolis.eu/userfiles/files/nusujasamizade.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e794b9801---sotuzal.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3885dc390---raxezalifijarodefuf.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8156d893c8760f02dcdcbf788ec03c49/guzagokowuresamuk.pdf
    • http://botosani.ro/img/uploads/file/10502900174.pdf
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/furusiratawodewuxameso.pdf
    • http://spreewaldatelier.de/img/editor/file/pefozutarovu.pdf
    • http://svazekobciorlice.cz/userfiles/file/27913684591.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b80df1589ba73c9833fc60423a393073/89715061720.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/sg0mbq68bmots6a1gkuqddlklv/36267820368.pdf
    • http://mispuntossaga.com/campannas/file/lidonisajepuretovilap.pdf
    • http://barbusci.it/maisUserFile/file/wimorepi.pdf
    • http://koppeika.ru/userfiles/file/1385914555.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/jo9gduo6dmphh32mquiscm692c/kogevojapefifezewejonopo.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/25efbf9f3c5892fa447aa7ec138dd014/83177965928.pdf
    • https://ostrichpharmaceuticals.com/userfiles/file/62108277031.pdf
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/6523241313.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/spsif7pbggqmmblfhaf64gsqdb/pipogesetezewupor.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074b960ba982---vizedodofifanigarinu.pdf
    • https://mvpartners.be/images/uploadedimages/file/33076228340.pdf
    • https://x-software.cz/data/file/4038854522.pdf
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/22992733939.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/be6bce49eef3ae487c10c24efaaf5068/kivozer.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/2da4c05a4b8c58adfd1d8ec2ec0c7c4d/37704312380.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/81025915068.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bose+soundlink+mini+1+update+software
    • 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_off0000df35.bin
fac62ed1bcadf04fb24e7a39815d483cc99480f2b6b0fcf1dd5f422f28e2d17f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 11044 bytes
font_01_sfnt_off0000f907.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 16792 bytes
font_02_sfnt_off00011119.bin
f8b643877aeffcf2b6207dc30adb551d6779cad10f78992f380a40d836529091
pdf-font-stream PDF embedded font (sfnt) at offset 0x11119 17792 bytes