Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11eff36bb75db5f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 08:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 635f4bc0b74297707d7625aacfa6f7f7 SHA-1: f81bcc5c6b2da345848a7542d833d1b43a38460b SHA-256: e11eff36bb75db5f01712f4c72f3c3da43105cfb22a9757cafcc4ad6076ce820
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing and potential trojan distribution. The document contains numerous URLs pointing to compromised WordPress sites, suggesting it's part of a link farm designed to host and distribute malicious files. The presence of urgency and callback lures further supports a phishing or scam-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=check+your+vocabulary+for+ielts+pdf+free+download PDF link annotation
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e891044e6---warewobonovudosurapudir.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a91ec77d8c---lixobasofajawonegomogejiw.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/pefaletusuxekapakivafuguw.pdfIn PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/peris.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c317f3087fa---2510827119.pdfIn PDF document text
    • https://blogsma.com/files/47913556302.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/vabafabarabamutetopunit.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ef8f60f4b---27487203301.pdfIn PDF document text
    • http://kleiberit.ru/files/file/52197254206.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/mogokadujomu.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/38510569940.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/miwazodupaxu.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f0c4a6ab---dexesipogilodejamepimod.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/41838971095.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/jawetinelikemonoje.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160882b3952f2c---luzusofajixoleragafokev.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/vewezumekewixupugedetuj.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/pawomofudipimaxowunetuvam.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc885b008d---nuwovuvekubizumatabomulej.pdfIn PDF document text
    • https://bselink.com/userfiles/file/vesutakosal.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f374cbdf0afce53d29973c47a970dbb8/47002623217.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/radulogogakuxijujavubojuv.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e94457b9f---tabutalelijem.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/26432e30cb9c60dfb01b934848f5fbb2/vemadolanirofubo.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_off0000d2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B6 20464 bytes
SHA-256: a1c1db186ab21a7300df1361c40b967353c85103b027c47a4f799abfe4b69291
font_01_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001209e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209E 11344 bytes
SHA-256: 3d5bda9f75a7c720ff99dbb0070a1e8821bea1cb5b7a25b31d3f1a1af2437b5d

Open this report in the interactive analyzer, or submit your own file for analysis.