Malicious PDF — malware analysis report

Static analysis result for SHA-256 136fedc3c6e486aa…

MALICIOUS

PDF

89.6 KB Created: 2021-07-06 20:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 07a846eb56623270206c48f602e55fb5 SHA-1: 5a8bec46c2f913fdeed4936c796ef0749154a631 SHA-256: 136fedc3c6e486aaf3f9b8ed00adfb529d5bc3e70df38a3b196006d5741baddb
156 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 document contains numerous embedded URLs that point to various websites, many of which appear to be compromised CMS upload directories or disposable hosting. These URLs likely serve as a link farm to distribute malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=we+wish+you+every+success+in+your+future+endeavours PDF link annotation
    • https://acronimocostanzo.com/userfiles/file/71996546727.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/93130490063.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607937511b942---27591919392.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/acrkq6k6q11oogutkfig760qa3/fabasikilunamijebena.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3f2245c483850e33f62da108897363f5/giwagisujenoxatakuposuvi.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160878ea65cb3d---32575115762.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/sjcgf657spt416df44oblqnu1t/lesaradaku.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160883789c0922---lurirenuvipafikejaxajul.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d15265e359---gobofef.pdfIn PDF document text
    • http://innotack.com/userfiles/files/78305865447.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9437e16e69---49218436215.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/4090aa21bed3a70be76a84e578c2946b/97160143456.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/80077155757.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/loserajolarigezuruf.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ibpefphten2pb7n6q99ju5d50a/65165385991.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b82501f4a1212597b542c9cc3e9aa67/kezilutanuxumolaxi.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/36838632452.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/2b7b102fbeb9e4149aafa832e11629df/99329474819.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/73065134915.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/f1085467fa32eea0cfc1e4b1bef7b5cf/44883195386.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de4735b7d5---xexajedudagojopugumu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21dc1a0a5b---lomaxakekawox.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/c21049l6mj9nr150vfqoqqofq3/12410207371.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/6a5e3486d4afd3b8e6f818d6968948dc/zanupokevogusijodanenas.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11196 10884 bytes
SHA-256: f0dd8ec6eda35c6e71586c60625b10ec98582831996b7e26ce6d501ae0a1288c
font_02_sfnt_off00012ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD2 16924 bytes
SHA-256: 06ced88d0f75fb856eb6dcbd91fef77cdd6bce14e08e3d36201c2fae2694f67f

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