Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de046f048bedc9f…

MALICIOUS

PDF

74.5 KB Created: 2021-09-04 05:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1339b803566431cf39ab70b5a8bf569 SHA-1: 0630e5cda150e2985f94ef20daa32403712b4b3c SHA-256: 7de046f048bedc9f3ac386eface069b8d75c4fd3807f74b7db8b935ea7f5a601
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. These links are likely used to redirect the user to malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=insurgent+pdf+origin
    • http://statsale.com/data/upload/ck/files/44319067092.pdf
    • http://hulstcustoms.ru/uploads/files/93038617922.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874ed042aec---jadefumunija.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810da341ff1---13676967100.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609b08dc5251b---xavuvuzibe.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec43976f0d9---gajonanipepusipebabexud.pdf
    • http://bluecars.pl/userfiles/file/90425599956.pdf
    • http://thibangoto.com/app/webroot/uploads/files/pafopekerilukuka.pdf
    • http://dongduong.net/Images_upload/files/65893881154.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/53650f31161dc0b384accf77ccceeaf5/nudigiwafuduti.pdf
    • https://isabellepieman.com/userfiles/file/49667902776.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d79ca90c73---pibewofog.pdf
    • http://csc0535.com/userfiles/file/20210705200043_hewhl2.pdf
    • http://tythb.cn/uploadfile/files/24593424808.pdf
    • https://dianthusindustrial.com/resimler/files/20063369926.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/dba4c6dcc379389a845c463d1b9623f5/wisilizol.pdf
    • http://baraanduliaptti.org/userfiles/file/77456632953.pdf
    • http://www.heksan.com.pl/file/80808346279.pdf
    • http://amindoost.ir/images/upload/files/31204956057.pdf
    • http://bindashnews.com/userfiles/file/fasarimapubuvikumutaxaniw.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b7c8fca86608a1b1d1656c39b829f734/35188940163.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/7s39glc92hqgq3tr4oj3gtu7ef/13440794595.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609631799ca2b---32816078985.pdf
    • 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_off0000c070.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC070 16792 bytes
font_01_sfnt_off0000d882.bin
9a07bac36bc9ef19a75269ffa399fdd0992cf9ebc97963283f7f38ea13567195
pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 17260 bytes
font_02_sfnt_off00010550.bin
9ccb359fbd587cdfb5966a950003ca13415790f61d6a850c8b5a8d8b83a36c98
pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 10516 bytes