Malicious PDF — malware analysis report

Static analysis result for SHA-256 4acc13206a7ddf1e…

MALICIOUS

PDF

115.7 KB Created: 2021-07-04 17:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6b2540283709c1f33a20128f908ebac SHA-1: 5b9c94bab727134e4ec2b479c74fb5eb50908028 SHA-256: 4acc13206a7ddf1e8587f034d5d686c17d608cc341f5be046a94e1597edea266
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to compromised CMS upload storage further suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed44e7f78---94217258100.pdf
    • https://x-software.cz/data/file/gofewakazevegakefoj.pdf
    • http://lafenicealcamo.it/userfiles/files/88103861198.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b08c63d9ab---zitimejafibe.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/82afca1930e08c5362c5eb3c0729cf69/zomodelu.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160877a2f84a5a---11485625773.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160896fbfa3db5---66255292263.pdf
    • https://guapa2.com/admin/fck/file/15502818527.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa5d83c61c---71431537812.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d43b0f30a5e248d5f24f983063115095/34366314009.pdf
    • https://candbco.com/ckfinder/userfiles/files/mirelesolotukut.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/j36n9k9gv9qa854uj3eme4t555/87208283532.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6499bbcfb---34615002236.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f1335b50a---puvebarukereraxumuladu.pdf
    • https://sfasg.jp/js/ckfinder/userfiles/files/jasebaterutape.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b7814adf0967a4f50148f550a18d29a3/zusaruxud.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e4c854b15---pufotase.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607b427260c46---bolejeka.pdf
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/81279391349.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44d4c13a07---78633858783.pdf
    • http://stevis.cz/files/file/98270765253.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e15f3991004---nodijurejozusogolijid.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f8834f7eef3969979f6c8bcd8479dc64/19177744167.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607f41beee2b3---guzazipajitunedagapufe.pdf
    • http://traiteur-ribot.fr/userfiles/file/pisatozukegenizisapu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=surah+yaseen+with+translation+mp3+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000138ee.bin
f5c45b2686fa3a32b1d132f86ccc8b0c4f7086f6452e2c7ad34aa0507877d8b5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x138EE 36980 bytes
font_00_sfnt_off000120dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 16792 bytes
font_02_sfnt_off00017a84.bin
ad527af83ddc75edfb88a7e071f8d30e1535c66a7fd3a637520e65e01f759000		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A84 11204 bytes
font_03_sfnt_off0001949b.bin
cae8371d36c3885b9f3131fc6c79c392335ad0048b67a93af01293592faffe64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1949B 17148 bytes

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