Malicious PDF — malware analysis report

Static analysis result for SHA-256 0831d16d827be145…

MALICIOUS

PDF

104.4 KB Created: 2021-06-30 02:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf24d00a0562d58694aeb28fac728b2c SHA-1: 2babb58b5d67709f2bd4f5169d8ec972ca01d188 SHA-256: 0831d16d827be1457b76dddb35a839fa0d2492d0dca88c8cdeb42fb7b6133f10
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a machine learning classifier and ClamAV, detecting it as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, some of which are hosted on compromised CMS uploads. The primary purpose appears to be to redirect users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://mebelhotel.ru/userfiles/files/pesusuxakitimex.pdf
    • https://martensmgt.com/business_school/uploads/file/26483800311.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d586b94d---69998535184.pdf
    • http://studiovalentini.eu/userfiles/files/jiweduzesenoriwupimadasim.pdf
    • http://ahlhy.com/uploads/file/040642481270.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/049869e5aa5bb4f9ab251b7a90676ff8/42217630542.pdf
    • https://mm-podium.ro/userfiles/file/wuzutivisiw.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a72bda4bb---letugug.pdf
    • http://hublihorse.com/uploads/userfiles/files/91638644698.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608212cc1090b---purogo.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/49ujv8d6apon1hc3hpvrf1itu7/83237816310.pdf
    • https://stallion-international.com/userfiles/file/94378656308.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160760eb9eaea6---45074505097.pdf
    • http://bycongroup.com/UserFiles/file/ropupusobumu.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d6565ccd021---dilaronujoxuv.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16099370b8788e---mifetigazi.pdf
    • https://webtechnocrats.com/upload/file/59528091239.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a3b2cc85ea1f0aab2324ff2a82f143f3/zixebamatavepazub.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/aak4hjhs0nklp315p6rj868hbg/bovekosotojal.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd869605e2---pikodabuxunebumobezi.pdf
    • http://finproekt-msk.ru/userfiles/file/53532754618.pdf
    • http://dok-vo.ru/userfiles/file/satusefilujixej.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd84e37b4---53880007384.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d431937dbe---29464381236.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=calculus+early+transcendentals+3rd+edition+solutions
    • 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_off00012f3b.bin
0965f56e87f73090cb0800c77d9acd619dd9d259aed2fc645d471d7b78f71864
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3B 10780 bytes
font_01_sfnt_off00014846.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14846 16792 bytes
font_02_sfnt_off00016058.bin
0af165d92739a14e9f466400c55f8fe1a00d0349fc2592bb37765633cfc50644
pdf-font-stream PDF embedded font (sfnt) at offset 0x16058 19264 bytes