Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67f47cce2b1ea91…

MALICIOUS

PDF

86.7 KB Created: 2021-08-19 12:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d42c2cc834d0bb5443ddad88f24984b SHA-1: b48126570b51b1c73493cb5c23cd18a31a435ae7 SHA-256: b67f47cce2b1ea917d1b25b81337d7be80c70d77b9e228ce8816a9c9ab7157e9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URI findings indicate a likely redirection mechanism, possibly leveraging embedded JavaScript, to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/50e6aacc73c5cb30b10119a0594572f6/74091642030.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af69ab1dd93---gigowolinamiwaroxovor.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d69e796ffcfe82d047cc04cda7fa8aef/80339498498.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/967aec1debcc1efdd4db4e023f40a3cf/44830165799.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b79782b665---sunininemopu.pdf
    • http://jrjohnsonfamilyreunion.com/clients/0/09/090f04f22b165063c0e57546eb93b169/File/xowolovufo.pdf
    • http://texmet.pl/userimages/file/65324669220.pdf
    • https://rasathantrananotech.com/ckfinder/userfiles/files/77081020012.pdf
    • http://com123.vn/uploads/file/56127521478.pdf
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/15332007092.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bd787d4aa11---mifunifemikiranawoge.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b340a7220a9---pejavogenus.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16092115378a19---64217336359.pdf
    • http://neonyazilim.com/images/Media/files/jisimibabodewulupab.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/2645ffa541ce491daf4acad191687e1f/punerazetidinemito.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/fc4d178a50d72df70c3ef22bf38d9633/68703871947.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c3d316a84---49193754074.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/57702292640.pdf
    • http://agriturismofattorialucciano.com/ckfinder/userfiles/files/10896104028.pdf
    • http://innovad-ltd.com/userfiles/file/411661207.pdf
    • http://bukharasuwanee.com/sites/default/files/file/10541725636.pdf
    • http://svazekobciorlice.cz/userfiles/file/30816421025.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f7627723b---sawexekidedujotavijudum.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+to+say+in+a+performance+review
    • 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_off0000ec7e.bin
6c0b820764668be9b487abd7719d3b65b52997db06bd95fa7288dd8903ed04a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 10956 bytes
font_01_sfnt_off000105df.bin
69b8f93118527ae90ceeea7aadf68e22fd181621e56fcbe8c5189dcc0723d5b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x105DF 17592 bytes
font_02_sfnt_off0001339a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1339A 16792 bytes