Malicious PDF — malware analysis report

Static analysis result for SHA-256 3708f3afd9f1abf0…

MALICIOUS

PDF

101.6 KB Created: 2021-07-04 14:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ce394ffa4a42898cb822e646a7bcfa1 SHA-1: c5c471e6619e94d87e2690c55c650f02742697a7 SHA-256: 3708f3afd9f1abf0c18a75bb9ad650afb06ecbc3cd3e39b45bdc65c0a703eab8
164 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malicious intent, likely to trick users into visiting dangerous sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ebooksweb.net/files/file/sotunojanikifixuwemapu.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076662beeb8d---zadelala.pdf
    • https://aawyx.com/sites/default/imageuser/file/81087335419.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aec48b8f6a4---31765389530.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/12904de65561ac3e7fc82d9127da0789/94453019538.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/5gfrdufn5pvlppr5a59lsijdgt/48281355350.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/s78s0vk2n1i5t08p2sqv45qcuu/41945291172.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b123f6f729b7eeb8102263511c5141cd/49241095888.pdf
    • https://lawina-radom.pl/files/file/kolalemes.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8c3f93ff8159001470f2de84ee46a17a/81375436981.pdf
    • http://raczcsalad.hu/files/zawabamejawadelupetu.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd6fbcdda2---vekowoka.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2661201d8---tavanunomapoxud.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c438e26d177---rafazerisosivuvit.pdf
    • http://solarissoft.com/img/userfiles/files/89913523091.pdf
    • http://markone-tools.com/upload/files/sitesemabuj.pdf
    • http://unipsyclinic.com/userfiles/file/20210605135352.pdf
    • http://alexhofford.com/temp/files/file/77110162602.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/72f4fe1eced30cebfbd6f41dbf3de46a/48649072292.pdf
    • https://charterfori.ir/basefile/charterforiir/files/4691299548.pdf
    • http://gld-lining.com/user_img/files/zaxax.pdf
    • http://goldway.jp/upload/board/file/90998011158.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608742d5a7ab6---xenokaxepazevogosub.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=love+by+chance+the+novel
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE62 16792 bytes
font_01_sfnt_off00011673.bin
5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11673 16344 bytes
font_02_sfnt_off00012c6d.bin
8132171d014f616403418e2e1cf2dedd50e3f01968c9a976973df027a5ebeabc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6D 10244 bytes
font_03_sfnt_off00014365.bin
cef50a6fa670d6c7b6cb764e7a77f3182babcff430d9ca5697e010f42860f7e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14365 5064 bytes
font_04_sfnt_off000155b4.bin
fd098d7a402211a768b9172e0fd79565cd42e57beda42d0dd16b34a999ab55ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155B4 19524 bytes

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