Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb943e8d415230b8…

MALICIOUS

PDF

71.3 KB Created: 2021-09-14 03:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92bdfcecf9b9e187a9674d286e70c987 SHA-1: 0b864d4cf3b283608a74506adc205a76af64786f SHA-256: bb943e8d415230b82854c76def34e97c7d4f33a1d7280533928c64397af81d40
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://ashleymongolia.mn/uploads/files/xejojikuniwapal.pdf
    • http://hodoan.net/userfiles/file/segaloxedadalido.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2419cd188---lowogonusisaxefixebekuz.pdf
    • https://cncostruzioni.com/userfiles/file/80031102515.pdf
    • http://gamaxmotor.cz/data/dokumenty/5781964227.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613383738abba---benagomovur.pdf
    • https://ingatlanfelugyelet.hu/uploads/file/japivijupoxisiraxe.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a01b57fc67---zolixesabololuzilinejir.pdf
    • http://cdkkck.com/uploadfile/file/20210906202152.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4a5d3332bd80689c7456b7516b93a8f6/peximuvefibamusipemebarew.pdf
    • https://ximangcampha.vn/upload/files/14376009881.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4ad211786c011338ae99710999a37334/86317002413.pdf
    • https://posaonakosovu.com/ckfinder/userfiles/files/xitolesupof.pdf
    • http://dlzhrjd.com/images/uploadfile/files/30029190080.pdf
    • https://radio-clipa.ro/userfiles/file/ravelopigewoso.pdf
    • https://newcar-rental.com/uploads/files/202109020620436251.pdf
    • http://brixtontaxi.com/survey/userfiles/files/83079539270.pdf
    • https://tainandentist.com/uploads/files/202109020012353378.pdf
    • http://sluchatka-shop.cz/files/upload/files/dojipiwoma.pdf
    • http://les-dvorik.ru/userfiles/file/wapojikerutog.pdf
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tevuwisi.pdf
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/3905459811.pdf
    • http://wx-bm.cn/upload/ckimg/files/202109051820503639.pdf
    • http://cleanking.net/userData/board/file/kaneposewi.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f81b7b978---zilukukojaz.pdf
    • http://ks4073.com/file_media/file_image/file/16828897968.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hill+climb+racing+2+infinite+money
    • 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_off0000b7a1.bin
097586b801e69f2dd3e0e824df2e070f063df83175a44816c519e5f8094527a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A1 15304 bytes
font_01_sfnt_off0000de5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5D 16792 bytes
font_02_sfnt_off0000f674.bin
579da16705afd83effec675da0eefce3de9cad72f35e10f90abb93604fca98ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 10876 bytes