Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f1cf98449b21f9…

MALICIOUS

PDF

84.4 KB Created: 2021-09-18 22:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10ed373335c82d04c6648cf5b9567ebd SHA-1: fd83b2dbf3437e766beb7d2159ab06f7cf8be049 SHA-256: 17f1cf98449b21f97e52b7e6193c41f3953970a918af3d90924cc0f66a0374f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm used to distribute phishing content or malware. The presence of these links suggests an attempt to redirect users to malicious sites, likely as part of a phishing campaign or to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://drafthe.ru/uplcv?utm_term=antivirus+for+mobile+apk
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/xulegagifi.pdf
    • http://jamalcar.com/userfiles/file/namajutisajes.pdf
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/jujotukipizuxomad.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d51319bb6d53798adbe79b1052b0bceb/92443170632.pdf
    • http://a1climbing.com/userfiles/files/15187962000.pdf
    • http://veronikavilla.hu/userfiles/file/76517027127.pdf
    • http://relaxzenter.com/uploads/files/95531027724.pdf
    • http://nemeckystrakac.sk/editor_uploads/files/konokoxilolekupana.pdf
    • https://www.confirmedtour.com/files/66851937996.pdf
    • http://interroadholland.nl/userfiles/file/92555287721.pdf
    • https://ladangmimpi.com/contents/files/rasejo.pdf
    • https://junona.manyel.website/images/uploads/medium/31384429132.pdf
    • http://mgtofubbq.com/uploads/files/minekinofupodaduburefu.pdf
    • http://www.physedu.in/newsite/userfiles/files/12938467915.pdf
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/wetazixigolaxejikupe.pdf
    • http://cioccolatogallucci.it/userfiles/file/72753969016.pdf
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/4717729570.pdf
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/texifalidazulojoko.pdf
    • http://nifaelectronics.com/userfiles/file/28975113099.pdf
    • http://360global.ca/userfiles/file/89873195621.pdf
    • http://eperon-kochersberg.com/img_db/80088903788.pdf
    • http://agriturismolataggiasca.eu/userfiles/files/muzesa.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613567f7286cd---derakevizebujetu.pdf
    • http://geodavidepini.it/userfiles/files/37680161570.pdf
    • http://shuimotongyuan.com/userfiles/file/28002048468.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f4a1abe5460effaf49c1b32fc600165a/94974180072.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e121.bin
dd8351729f9863252f1b3ada197110f17d955a5dc419eef99dcbc4bd8bb17012
pdf-font-stream PDF embedded font (sfnt) at offset 0xE121 18916 bytes
font_01_sfnt_off0001127c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1127C 16792 bytes
font_02_sfnt_off00012a93.bin
45156155543a47d3612a89117527a70ce4304db8165e2e5d90fb6d1848a1de20
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A93 10896 bytes