Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb58f37cb3e8636…

MALICIOUS

PDF

111.0 KB Created: 2021-07-19 07:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e6166747851dbd14f841e30b3bb6deb2 SHA-1: 34798b723110c8b3488c5dd9caa4f6e302f8d5ef SHA-256: cdb58f37cb3e8636127dd646a9b2da977915b30677a43d0732070dc2a396d552
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress upload directories, suggesting a link farm designed to host or distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of external URIs and compromised CMS uploads points to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9760

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 https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d00c930514e---wipifolemezipabivideb.pdf In PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089922e154ca---kigisosakobupuma.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/xikuxik.pdfIn PDF document text
    • https://campermagazine.tv/public/file/20097308197.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/sudomalokisugudug.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c866b82efc2---50337122689.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/fotikuvowarudob.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/50176947481.pdfIn PDF document text
    • http://jump360.co/upload/files/20210622200854.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f368b9917---dilog.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979e78c4093---64596141284.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e0a17a9a---20934906416.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dbbf46cf7---sirisudukaz.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/69466723161.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/76951879742.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/vapujovulipisikubazimu.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/kituzogavoposefopur.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/46160461368.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbadb1ae57---46310372551.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd1203319---xirurizik.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/rujokodabafasuvu.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/4da7a4ebd28db35c38a0a4e7b8fdcf07/33916731413.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/17136516123.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b966d37e4---luzimeratebikebimavaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=flower+dissection+lab+activity+answersPDF link annotation
    • 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11168 16928 bytes
SHA-256: 2caf0dfeba6c6a8eb9aab7563d311de1a5caa3ebcaf75878671b4664d5b4a37f
font_01_sfnt_off00012a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A04 24036 bytes
SHA-256: d4f04644aaeee7d4109e07ef91a6f92f3b528cfa0f494e42676c82edd97d0d3c
font_02_sfnt_off00016a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A06 1004 bytes
SHA-256: a91bef199b57d441a7cc099ea51fd549ccc575116f5adb23305e451cf91991ca
font_03_sfnt_off0001715d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1715D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001896a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1896A 2536 bytes
SHA-256: 915a14bc31df52e75168bd7b6815826c470296f430572067686b032d6ef2aa6a
font_05_sfnt_off0001942d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1942D 10748 bytes
SHA-256: 330a60e53493720eddb85dea3c07d474cc2a28b7f3daeb277622550495fb265e

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