Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfefed5930c4065…

MALICIOUS

PDF

87.3 KB Created: 2021-06-26 22:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94dd552f69f149930a6fa592f595db7b SHA-1: 07cd94aafa22a453511e812357aa665b6a36deeb SHA-256: cbfefed5930c40654dea1d0d4d89d934459cb1efa2da22ae87991e15d44762c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and the 'link farm' heuristic confirm the document's primary function is to redirect users to other potentially malicious locations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16076c4fba801c---juzokilagajoxiginar.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c2af72907---ziguzakataxugawubo.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/tk2bjfppuhj512taicubq8uek9/52941504150.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a65f42a8401---vedizovuro.pdf
    • https://torgradio.ru/new/files/file/linelo.pdf
    • http://thessalonikiflights.com/files/files/12458172624.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0532e8c920d349b0789b9d47dfe638ac/zemajegujuwasorano.pdf
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072c5bdc3106---49292043565.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/r4m6m41qd1555ghkaqdttls6m4/xanoxamegonugonafa.pdf
    • http://humanlitech.com/files/files/vamopibanozikakoguboj.pdf
    • http://tajeer.co/userfiles/file/11890264859.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/2a3celpc4svjnai4hpkf468qm0/nixosafirarulof.pdf
    • http://makinsushi.com/uploads/files/39006612242.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae24c0d5fe8---39892053230.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/7a57cc705491535c339bdfdc68e48156/78856415349.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081767ddd722---fanoven.pdf
    • http://ty-universe.com/image/files/20210621_034341.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16086a293254e2---82631137042.pdf
    • https://beldaoyun.com/calisma2/files/uploads/21019080116.pdf
    • http://ypperfect.com/ckfinder/userfiles/files/bikubok.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087628fa999f---46253100862.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/02111c8ad34a4677651536de386a4fdc/bikaru.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/5f3081bcf663d127da98c4b2b64a36f5/60244598523.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b8321f7097b31dbb307e9a2d4c6eb21f/83593096731.pdf
    • http://g-shocktou.com/user_file/file/babawukivixo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=will+dentists+close+again
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2ac.bin
2b6daabf621b4ed89c1ba1e5764ead4b8a289f4ef58ecbe6785b32948e356090
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 17368 bytes
font_01_sfnt_off0001200f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1200F 16792 bytes
font_02_sfnt_off00013826.bin
325a5c6c89996a77a8dc7984a4db9713ebd7a3aa072235c022a80ff970b106bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13826 10440 bytes