Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a05e7bfbd6b35c0…

MALICIOUS

PDF

86.0 KB Created: 2021-07-25 12:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 860289b5c928aed0e3a9ecc9b12e245c SHA-1: 7f923d927855101cf2218b82e1e73412a89d6979 SHA-256: 2a05e7bfbd6b35c036e4a266ba1ca535115011cd18ef56d554e16f7f3fac0720
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The presence of a 'callback phishing phone lure' heuristic further indicates a deceptive intent, likely to trick users into calling for fake support or to resolve a fabricated issue. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/fc5e862541a12ef62f8f50e364def5c4/54973618855.pdf In PDF document text
    • https://pbchistoryonline.org/uploads/file/wibitexagogogus.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce146c445df---sedejapopopodinuwinibeter.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/lixaxanap.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160734889bad18---winiruzaxogikofipifar.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c3479f592---megosalog.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa4d847025---65925700311.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/logofabifaxejotovutifo.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/damosamal.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/73909830646.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd1109855c---puxiberixer.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f50436ce5de---mamemiro.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/woravasurukubobiruke.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/44865754317.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/481bc5eeb77f1f818ac26376a019247e/jikodavegetosolasefuloj.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/kafalemixelexinaluriwiwun.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/481157174.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/88397458521.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160860b123b2cf---tililurizut.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/71397356319.pdfIn PDF document text
    • http://damoorefamilyreunion.com/clients/7/71/71c8bb141a0941b69292984b9770a174/File/detujikogagigorewoxa.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baca9dcd533---46531192439.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160736ff657c92---vozopewukinit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ghost+in+the+shell+movie+download+in+hindi+hd+480pPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 17756 bytes
SHA-256: 05a3a7e9679636f2e3f52567cf9d51eee89bf3af519f9815789f896525b7cf3a
font_01_sfnt_off00010d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D45 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_02_sfnt_off00011684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9B 11156 bytes
SHA-256: 96c3f24569c3446ec37328c3964610c4e75ecc40a0b43d88ff58e5759b29ec21

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