Malicious PDF — malware analysis report

Static analysis result for SHA-256 051f5596b664f458…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 14:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24e4f1e174d70183e0a770078f673b8e SHA-1: 4f600796848ec232da08b7598556e3625af97496 SHA-256: 051f5596b664f4585b116f44356b5a5a2f36a9ebfc687b74eb2392c5942bd634
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://catamma.ru/uplcv?utm_term=model+qs5509a+hard+reset PDF link annotation
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/753868c9f8fcca363e7752871f8c17cb/73722772415.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/2392762208.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/24936660709.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/visebobivizufe.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/97074131043.pdfIn PDF document text
    • http://torgoborud.org/images/file/53621148703.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/70729299187.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/77238911010.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/mizakigalegusaxutekopo.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/vogozapowe.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613de4fb6c513---17229811562.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/77019092546.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/79273642063.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53b44bfe2---kikaremotojudopum.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/sowupisogiki.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/fitatomakase.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109070128009828.pdfIn PDF document text
    • http://honda-vo.com/upload/file/77531286140.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/74172532965.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/nojumipineli.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/52630447252.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/kaxubiveborus.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/mokotafuxuzepifowotin.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/72976194635.pdfIn PDF document text
    • http://tes-sys.com/uploads/ckfinder/files/20210910/16312282468098.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/70778102469.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 19380 bytes
SHA-256: 8b0c0d9d3414f65618fa05bc0ec481cb9a5d5bbd3d59ff79393b5f82b56648ba
font_02_sfnt_off0001202e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202E 10712 bytes
SHA-256: 14151024907d88bc291ebae1dc2fd99087e48f0299eb52e3f9af3cf282131cb1

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