Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c58f3c8d3479a2…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 20:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc3f4394435730dbb286bf148ba15a21 SHA-1: b20762f7b05c41f06521928f6f4e25d5651464b4 SHA-256: 97c58f3c8d3479a252be69dbf77373376aa145de67df89555600e7841c099e0c
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or distributing further malware. The PDF's structure and the presence of numerous external links suggest it's designed to exploit user trust by leading them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pk.mo/userfiles/file/renudimilumirerorek.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161471556753d4---jidotulegenixesanagetati.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/zilibo.pdfIn PDF document text
    • https://kralpin.com/calisma2/files/uploads/75279759208.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/41051477707.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/92958353078.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/tenumamenoma.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/34987351220.pdfIn PDF document text
    • http://knipia.com/userfiles/file/xafajomen.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/4287105117.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/dazizutibazanaduterojuraf.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/juwesi.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/95526948103.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/3eaee07abddc0c5f462f80cf2901ce56/61214051059.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/72775707812.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161483d10e45dc---telose.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/zinojebul.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/nufubawikelibebevewijani.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/mitatepiwekowitaxufowax.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2bmfsmtqm9bfn4jmmvtrs1m0u5/wisoxadudojude.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/35178158240.pdfIn PDF document text
    • https://bor-diing.com/upload/files/83302924369.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/rirujoxisej.pdfIn PDF document text
    • http://coumert.com/images/file/migugabu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/b7lqo8pgf317ooethvmmnrlb5b/80026588783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pixel+experience+note+6+proPDF 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_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF748 17972 bytes
SHA-256: 32779ad400eb7479498a72a26fb086f4209b4d09a1b8600066f1447230cd3261
font_02_sfnt_off00012653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12653 10308 bytes
SHA-256: 4b9bcb2a111998a9fe93e4c2d6ba0f56b80d6ecb17c7169b67b197f95abe171b

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