Malicious PDF — malware analysis report

Static analysis result for SHA-256 170e1396b1123b20…

MALICIOUS

PDF

97.5 KB Created: 2021-09-13 23:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 42d6cd09e16e742528b3aa0637a2769b SHA-1: bf98ce4c288fe437b7f90e4baf4be3e2ef7382be SHA-256: 170e1396b1123b208ada69448ffd0ae4cc9ab15aadcc43c22b0dbb40cd982aa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and potentially malicious PDFs. The presence of numerous external URIs and links to compromised CMS uploads strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://pixomot.ru/uplcv?utm_term=android+kotlin+get+screen+width PDF link annotation
    • http://alompar.hu/uploads/content_files/files/jewugemulutadaterojos.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/forulali.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386632691c8---ziwasekawamifarite.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/fivepirukilevuxineg.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/zapobunamilafiregib.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad7c9be7f---jutaledunutametisiju.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631022154.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/52472023248.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///5791071593.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/33815120859.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/jusugovulev.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ad27c46397f6ee019e26501f6b538af2/rotubuzu.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/43571527927.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/ketamemupogalokekisika.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc9160eff---zogofazidatap.pdfIn PDF document text
    • http://runhouchem.com/upload/files/1751593383.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/nevel.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361d5074a4b---vofaruvo.pdfIn PDF document text
    • http://talleresjpg.es/img/file/97453540025.pdfIn PDF document text
    • http://friulanapanini.com/images/file/luwadavi.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/mavezinenafa.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_off000117e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E5 18384 bytes
SHA-256: e78e4e8c9eaabf17e5fa58b033e032e45802de1b6ae17058d5ef35debdfbacb0
font_01_sfnt_off0001489b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489B 10644 bytes
SHA-256: 2fec3755b4d089daa675337e9af3879528df15565bee1e11dfff2e01b970f372
font_02_sfnt_off000160c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1