Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d586a670a85a93…

MALICIOUS

PDF

104.5 KB Created: 2021-07-03 22:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b77fc3802913ab8238396ddaaee635c SHA-1: f8979b5ff27e5e974c4dbf6205ce5fa5445f8eef SHA-256: 58d586a670a85a93d414524978508bf10eb6555badde4f55442b65cee8af2728
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and other potentially malicious PDF files. The primary goal appears to be directing users to external, untrusted resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

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://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071353f05c14---96302968776.pdf
    • http://turinhotelcompany.com/userfiles/files/titosesifanafabuzo.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c730b1ce1---4431948120.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2221c224664c20116a8469eadc50b89d/dafilabepuwezove.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081207c29bed---kasiraxazatasiwokesukor.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ihoif9dg215dhkg8paraeepdp2/20125623402.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fc4f4410c---keden.pdf
    • https://confetti-seasons.ru/upload/files/84363662935.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4d134ef44---87505408382.pdf
    • https://ludifrance.fr/userfiles/file/sisupiludawuwutoro.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b50222632d1---34762477286.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082e553ddf1d---95530996698.pdf
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buvurefebovu.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/3a8938ba79794f1e046ba2103fa0dc65/nepasimekinotejediliz.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/aak4hjhs0nklp315p6rj868hbg/bovekosotojal.pdf
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/18772648778.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/81016056316.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609600b57c01e---48758059831.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1ee36af46---74416823628.pdf
    • http://bayernglobal.de/userVZ//file/kobawifasimatixagum.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/2eb9608ed1d3145df0b00aaffad29498/5143564285.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/bndrqugvap9m7ato0l764in0e0/82904785872.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f75984835---96901625240.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/05f852953f7dc8a75d19c0a5d52c6864/juvum.pdf
    • https://dovolena-jiznicechy.cz/uploads/rewusiserazesiruzivap.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=harsh+meaning+in+english
    • 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
stream_005_off00013283.bin
e44b6dc08ea7fa734502b552ed2cb97cf829aeff4cca13cb4c137eca5a01e260		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13283 19216 bytes
font_00_sfnt_off0000f3d5.bin
09f59bd859cef92c99ebd5749589ed65ea966d36f3577587188018e5c5202f0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 4168 bytes
font_01_sfnt_off00010376.bin
c50ad9c0082359b66680e35e0129b1319569d66f645e78be473f5dadec08f311		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10376 10328 bytes
font_02_sfnt_off00011a72.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 16792 bytes
font_04_sfnt_off00015332.bin
81ac4ac1287d2f7bdad0d1f3521e0412ab8b91da6e24d4918d37e64be51d53fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15332 26224 bytes

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