Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fb7376ee0dfa6c…

MALICIOUS

PDF

87.3 KB Created: 2021-07-03 20:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ff24c3126c02678e56e15a7b6cde1bd5 SHA-1: 30766c1fa42974adb9ae7c209921dfa23f77d8cd SHA-256: c5fb7376ee0dfa6c37162fd9ec7b5d007fb497df3960a41fda7b68fb0811cae6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised websites, indicating a phishing or redirection attempt. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan. The file's structure and numerous external links suggest it is designed to lure users to malicious content, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://aryajob.com/user_upload/file/fegonenigolonixisukesokex.pdf In PDF document text
    • http://zae.me/datafiles/file/49003080763.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/s9vaevt133k3hsjr4qtpp35383/sidija.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/355130fa0b76c539f4d73e3de0c2b5ae/9875986884.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91bbd429f1---nafin.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/pewezigizuvatewuke.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/eedd64fccdf6cca18147d192358abd5a/kotabu.pdfIn PDF document text
    • http://servmed.net/userfiles/file/29376944540.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/60356230163.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/1848895023.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/43636084082.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/5890048576.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d826cbd4ff3---13513366602.pdfIn PDF document text
    • http://builderall.info/userfiles/file/gosekosodejejopexomibone.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/b4adb765accf4053abecc4505f482ef1/23412500843.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/kedoruzojamivat.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/32717410013.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84309bcf60---91415528993.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/66e49c39c2e447a2fe151f53d9870312/sasilusu.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/78069261403.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/f773e6ae16ba9069a92fb186b70709f9/40985373209.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/6d81cd16ab6c081110892cda1d761ce9/14815598404.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/58127125983.pdfIn PDF document text
    • https://tcremich.lu/files/files/64560267813.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/43531101955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=minecraft+how+to+use+name+tag+on+horsePDF link annotation
    • 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_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 17804 bytes
SHA-256: 4f147cdce45431807d75bbcfed75f4d09b07b7f371d28ba0a8da889b95c10def
font_01_sfnt_off00011e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E58 10916 bytes
SHA-256: ab9caac1da2f273e3df1bbfb53874767575dc0a5433d1282e69b576377435df7
font_02_sfnt_off0001378e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1