Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d817e509f487e15…

MALICIOUS

PDF

111.9 KB Created: 2021-10-19 21:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 496f2d38d3b8fa5cf47f2c6ed5b1bb74 SHA-1: 1283f4e37928f913a5521eb9b0dd76fd984b7840 SHA-256: 1d817e509f487e15b3c4982e8949b730d4133bfef2e4e247a3f9371fae7454d3
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve as a lure to direct users to malicious websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1616751dc75c75---kafewubasilezivep.pdf In PDF document text
    • https://fitvital.hu/userfiles/files/14219015172.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/37522550132.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/tobexagot.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/35600862264.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1616cca255f409---gonafexumizexegumubav.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202110190903286217.pdfIn PDF document text
    • http://kes.org/upload/editor/files/loduvirafe.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/porotabovixowogatigip.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/h08poj50jq25t5ui7hamrr4ti0/88864273832.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/rileseta.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/44805939016.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/2584582823.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/10162171901.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/90897933992.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b844032b18---rukugarefozigubel.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/gavipupazefolub.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/43717478975.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/31855702409.pdfIn PDF document text
    • http://zgic.ru/!upload/files/98522962278.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/febotaxozivalazisemepijum.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/68223041408.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/dojaxemafuparozujopu.pdfIn PDF document text
    • http://surausa.com/uploads/files/83591955255.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/situteveni.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/4dZi1sgP-vI/uplcv?utm_term=how+to+measure+adversity+quotientPDF 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_off00014db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB1 19256 bytes
SHA-256: 1fcc00d90aaa6d0f68718fafc512f66dbb757be07e0dcc664c6ade4a41c1010a
font_01_sfnt_off0001800e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1800E 10868 bytes
SHA-256: 56b9ccf83604bf9d2ebe2107e9c05535c5fe51da9024e95d2d027a9cb517bc18
font_02_sfnt_off000198ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1