Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56c2854cf152aff…

MALICIOUS

PDF

67.8 KB Created: 2021-09-24 21:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ebbe617ff172598a0eefb686593d5bc3 SHA-1: d099c59086c1c6b07d502c1f8df8d5a4c02f6fbd SHA-256: f56c2854cf152affef05ed917b89d22339bbc3e91c49b44909bcf17f162dbfac
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to hide a clickable malicious link. Heuristics indicate it contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior strongly suggest an intent to lead users to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://kingkady.com/uploadfile/files/sajewumazomenefojutu.pdf In PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/vokigudejasomutawav.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/77591948716.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/fawakag.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/mopogob.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/darilopudobufegiruzesotaw.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/556576e2bd6cbf98187c4341052f1236/pozapiribafumiruluz.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161492bf012d9d---fezomariwajavowovifam.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/52833075866.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210917154753.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/wozapejodamexusitetaw.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/19851758585.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/39414410381.pdfIn PDF document text
    • http://proxima-design.cz/files/file/75655218329.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/7dumbrgk7ivf8thf9bjo2in23j/53337956506.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/xifizijivopixunalozesujot.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94d87f1dc---28274681802.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210913130641.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/15627234511.pdfIn PDF document text
    • http://cib.lin1.ca/phpsites/vertical_living/uploads/file/37558350117.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/4386333876.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/ziriradusupaxowapefufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+emulator+for+apps+not+gamesPDF 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_off0000ac36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC36 10924 bytes
SHA-256: 2842a3cb95304fdf8b19310c72b2dda3a3661856edb07657008d3601cff90836
font_01_sfnt_off0000c549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC549 13852 bytes
SHA-256: 0f6dab041d8544656ca3ba06063badad0a60cccde34673d0728d0b0b3980090e
font_02_sfnt_off0000e7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1