Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1924318d35af182…

MALICIOUS

PDF

111.3 KB Created: 2021-09-03 13:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 63d68beecbab54837522c14005ce17e9 SHA-1: 22a98d8686a84e89030e49c746fd089baf37adea SHA-256: a1924318d35af182e36057f0cd39802d074fcb92e39f87dce3f6c7a73f36078a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://hbfilm.ca/resimler/files/97088809442.pdf In PDF document text
    • http://olympusflights.com/files/files/jumiviruzogewut.pdfIn PDF document text
    • https://angkagenap.com/contents//files/23900703604.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/kanadutigexixaburiju.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce71414691---30712622700.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/7179906195.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/penuvenujomegixe.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/3894047017.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/6e26400bb2886d7bc8eb4909b84f06df/63064179871.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/rinmhjks0bpcabic75qqjpbirk/14133578050.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/23809413974.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/bafizibapo.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/15555932885.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/33852883308.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/2rphr8r430gvu5f2u2lqqdjl11/wamuxabasisabiwepu.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e67ce4b1c4a---61173729314.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210831_175634.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e83d67d3e1---52237239639.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba06ce3140c---41382552466.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59b75ff54---38513775795.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5a4088f7cf57545f22fc4ac828ed7001/44989929371.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9d1b04e09---futizoxigixewizevadexus.pdfIn PDF document text
    • http://scro.ru/pic/file/tibamomiwizarafupa.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/kidewubila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=frigorex+fvs+1200+manualPDF 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_off000146b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B0 11000 bytes
SHA-256: 88cab7df598df38e25b188655902027c3b8efc2ef6fdb69c62a822e55955c74d
font_01_sfnt_off0001604f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1604F 20496 bytes
SHA-256: 79180f920297ecc3f6cc702f3ed3584154beb8e356dbc76d3ba9a8a1af5fe576
font_02_sfnt_off0001960b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1960B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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