Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e81fe9d68b6d1b8…

MALICIOUS

PDF

87.1 KB Created: 2021-09-15 18:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 21493af15b77d7163f79348c1c4280ba SHA-1: 777ce09dc5da343860059c658884c9b75f5627c2 SHA-256: 7e81fe9d68b6d1b81fedb4fac24f3eecd78b32ddb35adec578d99ea23f51d3ca
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with one URL specifically mentioning 'apk football live', suggesting a lure for potentially malicious applications. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=apk+football+live PDF link annotation
    • http://www.radio-kum.si/data/files/binuva.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/c803ca032ea9779e6269a3e9731dc4b6/jexovijolubejadudik.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/muzevupo.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/vawevibulevepolegobip.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140c7506391b---tiwune.pdfIn PDF document text
    • https://avela.md/userfiles/file/kapidonavopezenelasone.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/dokezofibanixajokusele.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210908090310.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/69051997789.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/womepobisofawelosagoxo.pdfIn PDF document text
    • http://mdtrend.hu/files/file/58572471792.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1612fba1d9d877---mopebixa.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/12088141399.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/26247861244.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/3617797675.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/biwedutaza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb0971fe62---62701320492.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/nugedaxidujofe.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/97309498373d78064f04e6f1a6777426/57613695077.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/50645484370.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc824346e---52172482804.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/kigesifepoxazujewono.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/24801234255.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/77482072820.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC884 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_01_sfnt_off0000de67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 22168 bytes
SHA-256: f8b6b6ffcaa92b3dc2134443691f671faf035ae09ca6613983c10dd809c0231f
font_03_sfnt_off00012e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E51 10260 bytes
SHA-256: be6c9f24e4a7b80c15392ae765c2f6ba8434ac1453efdeef746ab90c8b0b815d
font_04_sfnt_off0001454e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454E 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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