Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae7343b583402dc…

MALICIOUS

PDF

78.3 KB Created: 2021-09-22 15:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61c474773b11a896eaa2983a9286a1de SHA-1: 57650c4a801ee4c27a222463de32559e22578fbb SHA-256: cae7343b583402dc4d316cd9d42abbd4913dffdd430e19fb612ec2108bbde099
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/6auumbfb0v0vbi9ti0saqjp7i3/neresimegakenaduw.pdf
    • https://sentinels.ro/userfiles/file/luwatiki.pdf
    • http://huabulaw.com/uploadpic/2021-9/file/2021090811574973499.pdf
    • http://theorientgarden.iorderfoods.com/uploads/files/6244430457.pdf
    • http://skulpt.in/admin/uploads/file/kekojufinepi.pdf
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/levusunefuwoxedivavimove.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/ec5b84e407fef875101e709c0075dfaa/jiweb.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393fc512f3b---55840830360.pdf
    • http://uptownherndon.com/uploads/files/79008491172.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/87132509780.pdf
    • http://inventory-acepipe.com/images/uploads/files/96118169516.pdf
    • http://gammatradings.com/userfiles/file/65794557882.pdf
    • https://ingatlanfelugyelet.hu/uploads/file/50583604996.pdf
    • http://myucmas.com/userfiles/file/kutulofivizonobirolalofes.pdf
    • https://hetodon.com/fckeditorfiles/file/22043347619.pdf
    • https://eastoncn.housemember.com/uploads/files/vopizugudux.pdf
    • http://svenskafik.se/uploads/fckeditor/file/59638632871.pdf
    • https://hoangphatdanang.com/uploads/image/files/61358151131.pdf
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/zosedaweg.pdf
    • http://www.travelwithtaangoo.com/img/file/55019954257.pdf
    • https://nazrabilisim.com/calisma2/files/uploads/11801634222.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/valanidakoz.pdf
    • https://zoomkish.com/basefile/zoomkishcom/files/36919771432.pdf
    • https://embassyinvietnam.com/webroot/img/files/67191471123.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=factory+reset+deletes+photos
    • 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_off0000cfc1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC1 16792 bytes
font_01_sfnt_off0000e7d3.bin
d47667f8cc78c24999d2fb70af49ecf6d592d6f5866e26981ae67ac722a5853a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 16840 bytes
font_02_sfnt_off00011374.bin
c698362c150e3e5c61ca97b4b3bd9996d88d6f7021c78c119f0de05b213bbaa6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 10504 bytes