Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb04fb16dd0697f…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 05:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e47c7ffde077c700eb54a0693f41a44 SHA-1: 03acdb3e67dd7aede211dd82331ba900b3302c19 SHA-256: 7bb04fb16dd0697ff8d5d787129f5b162f060548927a6dfb5a337c69326b2f5c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4cda6a5101afe28daf153ee75c3b5551/kibiliwutidenegoli.pdf In PDF document text
    • https://hagakure.by/upload/editor/files/jikabapajavefeleda.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/misugefigokuvovojofam.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/c4gj7d8drvisnn07ubda77atf6/53946675173.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/xikux.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc83841a15---xozasafediboj.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a559310dbb3---zonagakozapitomaro.pdfIn PDF document text
    • https://hoongnau.com/upload/files/43052479047.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/318269c5e37a1839ff90160abe13837a/bowog.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3781050bbe---7860820212.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/1cc98b751e48a28786b5cf18d004586b/81037732097.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/bisazakopikokijavifiwej.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/41219670702.pdfIn PDF document text
    • http://solsethreunion.com/clients/f/f5/f56c6d7ba488b74ef40bd02d3fc4d0b2/File/kekebeke.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160879ec320477---5183731079.pdfIn PDF document text
    • http://accronline.com/userfiles/file/87141069625.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/jejixipesogowadilobi.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/mefajalatokub.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210604_DFDCF14775FE29D7.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/47198986818.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/48720435862.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/guvopijajikedej.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fa66e6b22---lopigikaro.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/domise.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/74954162400.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/kimowijamagewibupokozex.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/nusiwonugesodufiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ejemplos+de+sociedades+mercantiles+en+mexico+pdfPDF 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_off0000de3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3F 20552 bytes
SHA-256: 5e3bc102e9fd26554759785a49a5836705cbc1c24cbb859494cf3b79aec0e92f
font_01_sfnt_off000111cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E6 10996 bytes
SHA-256: 0348398f5bec22356e7ec1b1b5efa734c340805ac69daca5404ae87af75ba724

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