Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec445bef9140f30…

MALICIOUS

PDF

75.6 KB Created: 2021-10-20 09:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c0870e1c4f28189b8a16739aa0be3c68 SHA-1: 54822df300ed9508c856db29486d6d8e387aa3cd SHA-256: 8ec445bef9140f30919ca0628bb73e2cf3448992a855e3c1df8c14778c2b4a85
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Numerous embedded URLs point to various domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself is also noted for having duplicate object bodies, which can sometimes be used to hide malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://queure.ru/uplcv?utm_term=what+are+the+5+bodies+of+water+that+surrounds+the+philippines PDF link annotation
    • https://strechybenesov.cz/content/jetenili.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/92fe006441158997db13078a4df6874d/zerobelazug.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/33726106448.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/83287480176.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/21416078334.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/154e284a5ee3561fc3ff689836789025/70919264087.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/fetajuwe.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/kakawo.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///75663637555.pdfIn PDF document text
    • https://gozdekadife.com/resimler/files/53402589099.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/tilezazativuvaxev.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/7034105320.pdfIn PDF document text
    • http://goldmustang.com/files/files/zozutevurapudezumej.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/94023453917.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/jugejusojiwoke.pdfIn PDF document text
    • https://okazionche.com/files/bikakobepokijaxitolifugom.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/99935128205.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/petedodoboromubewep.pdfIn PDF document text
    • https://steammining.com/userfiles/file/49900748539.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/50592545239.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/gatokev.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/its6duku10vjoihbi9un4bmu7a/maliwexuvufekupufal.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/45908940147.pdfIn PDF document text
    • https://objednavky.dortovapohotovost.cz/obrazky/files/28203401602.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_off0000c392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 11048 bytes
SHA-256: 1eba7c98925a8b9eb3b2904a01180bd009f7045a233ef6d4bc12f60192702b2e
font_02_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 16576 bytes
SHA-256: f894407acb9aa3460b8cd3569550e70cfed9048d93ebf8295f217496b4cf0866